[gcj] Problem-Preparation Guide and More

[Bartholomew Furrow]

Code Jammers,

With 2011 upon us and the next Code Jam only a few months
away,
it seems like a good time to do a few site updates that we've had in the
works.

This update has a focus on educational content: our old "Practice and
Learn"
page was a big list of past contests, and we've added some advice for new
contestants, as well as a list of good introductory problems.  We've also
added a problem-preparation
guide to
the site.  It's aimed partly at people who want to know how we get problems
ready for Code Jam (and includes the harrowing tale of
Ninjutsu),
and mostly at people who want to run a contest of their own.  As a new ACM
coach I really could have used something like this guide when I ran my first
tryout.

I'm sure there's no small number of problem authors and contest admins on
this list, so we'd love to hear what you'd have to say, either in this
thread, to my personal email, or at code...@google.com.

Cheers!
Bartholomew

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Re: [gcj] Country statistics

[Bartholomew Furrow]

>
> I can't confirm those numbers or competitors/countries are eligible, but I
> can confirm that the one in rank #28 (from UK) is ineligible, don't know how
> come.
>

That person chose to represent the U.K., but lives in Africa or Arabia.

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Re: [gcj] Wrong auth domain when clicking "Participate"

[Bartholomew Furrow]

Ah, you've stumbled into the AJAX API Playground easter egg on the Code Jam
site.  Good job!

OK, it's possible that this isn't deliberate.  I suspect that this derives
from http://code.google.com/apis/ajax/playground also being hosted on
code.google.com; indeed, they seem to share that particular permission bit,
which is harmless unless you a) go to that site, and b) don't want them to
know your email address.  We're looking into fixing it now.

Thanks for the report!
Bartholomew

On Thu, Apr 7, 2011 at 8:41 AM, Scott Blomquist  wrote:

> When I click the "Participate" button on http://code.google.com/codejam/,
> why is the auth domain for Google Code Jam named "Google AJAX API
> Playground"? Doesn't really inspire confidence in clicking the Allow button.
>
>
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Re: [gcj] Codejam Schedule

[Bartholomew Furrow]

Hi Ed,

We re-evaluate our schedule every year, and we'll be sure to consult this
mailing list next year as well.  Unfortunately we'll almost certainly
collide with exams somewhere; what country are you in, and which rounds
conflict?

Best,
Bartholomew

On Fri, Apr 8, 2011 at 1:15 PM, Ed  wrote:

> Any chance next year the schedule may be changed so as not to
> interfere with students who are taking exams
>
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[gcj] Registration for Google Code Jam 2011 is Open!

[Bartholomew Furrow]

>
> Ladies and Gentleman, start your editors: registration for Google Code Jam
2011 is now open!

>
Visit http://code.google.com/codejam to register, read the
Terms,
check out the FAQ , and
practiceon problems from
previous contests.

>
If you are new to Code Jam, be sure to check out our new Quick-Start
Guide,
which will get you up to speed on our competition arena and give you all the
information you need to get in the game.

>
This year, you can win a Code Jam t-shirt for placing in the top 1000; if
you make it to the top 25, we’ll bring you to our Tokyo office to spar
against your fellow coders. In the end, only one can bring home the $10,000
top prize—and the title of Code Jam Champion. Will Egor take the gold again,
or will it be you?

>
   - The Code Jam Team

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Re: [gcj] Registration for Google Code Jam 2011 is Open!

[Bartholomew Furrow]

It's possible that some of you had noticed this.

On Fri, Apr 8, 2011 at 5:30 PM, Bartholomew Furrow wrote:

> Ladies and Gentleman, start your editors: registration for Google Code Jam
> 2011 is now open!
>
>>
> Visit http://code.google.com/codejam to register, read the 
> Terms<http://code.google.com/codejam/terms.html>,
> check out the FAQ <http://code.google.com/codejam/faq.html>, and 
> practice<http://code.google.com/codejam/contests.html>on problems from 
> previous contests.
>
>>
> If you are new to Code Jam, be sure to check out our new Quick-Start 
> Guide<http://code.google.com/codejam/quickstart.html>,
> which will get you up to speed on our competition arena and give you all the
> information you need to get in the game.
>
>>
> This year, you can win a Code Jam t-shirt for placing in the top 1000; if
> you make it to the top 25, we’ll bring you to our Tokyo office to spar
> against your fellow coders. In the end, only one can bring home the $10,000
> top prize—and the title of Code Jam Champion. Will Egor take the gold again,
> or will it be you?
>
>>
>- The Code Jam Team
>
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Re: [gcj] Change of Nickname

[Bartholomew Furrow]

Eric,

Contact code...@google.com with your desired nickname and we can help you
out.

Bartholomew

On Fri, Apr 8, 2011 at 10:54 PM, Eric Kulcyk  wrote:

> Hello,
>
> Is there any possibility of changing my Nickname for the code jam.  I
> picked a silly one a few years ago when I wasn't serious.
>
> Thanks,
>
> Eric
>
> --
>
>
> :(){:|:&};:
>
>
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Re: [gcj] Query regarding rankings

[Bartholomew Furrow]

Umer,


>1. The ranking of CJ are stored somewhere we can refer to our potential
>employers?
>
> They're stored on a public scoreboard, under your handle.  We're thinking
about ways to make it so that they can verify that handle belongs to your
email address.


>
>1. Are rankings based on country maintained? If yes, then can you
>please refer me to the country-wise rankings of last year?
>
> You can find those at http://go-hero.net/jam, a site by Foxlit, one of our
competitors.

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Re: [gcj] Re: Programming Languages

[Bartholomew Furrow]

>
> Yes, there is no problem in using two or more different programming
> languages to solve a problem. However, all of them must be *freely*
> and *easily* available.


We actually changed that rule this year, because we didn't define "easily"
clearly.  Now it just says freely (but the links are still good):
http://code.google.com/codejam/faq.html
http://code.google.com/codejam/terms.html

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Re: [gcj] Can I enter my shipping information later?

[Bartholomew Furrow]

Hi Stonos,

That's the exact intention of that section: so that you don't need to fill
in your information until we need it.  Feel free to leave it blank for now,
though bear in mind that if you do win a shirt, you'll have a limited amount
of time to fill it in.

Cheers!
Bartholomew

On Tue, Apr 26, 2011 at 4:57 AM, Stonos  wrote:

> Hey,
>
> If I don't supply my shipping information during registration, will I
> be asked to enter it again if I win a T-Shirt?
>
> Thanks!
>
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Re: [gcj] Re: Can I enter my shipping information later?

[Bartholomew Furrow]

Top 1000 this year for a shirt, actually.

On Wed, Apr 27, 2011 at 8:34 AM, Leopoldo Taravilse wrote:

> It's pretty harder.. you have to be at the top 500 for the T-shirt if it's
> like the past two years.
>
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Re: [gcj] Question to the admins

[Bartholomew Furrow]

I'm excited that you're starting up this site, Ahmed, and I hope we'll be
able to add some tools for you to list soon!

As for the question of how to verify identity, by design it should currently
be impossible.  We're definitely willing to think about ways of making
identity verifiable with the explicit permission of the user.  We're a bit
busy right now, so nothing's going to happen right away, but here's an idea
for your comment:

At the bottom of the "Update Profile" (AKA registration) page, add a radio
button that lets you choose one of the following options:

o A. Do not publish my email address in any way (default).
o B. Allow people to confirm that my email address and nickname belong to
the same person.
o C. Allow people to look up my nickname using my email address, and B.
o D. Allow registered contestants to look up my email address using my
nickname, and C.

B would be accessible from a url like /codejam/verify?e=fur...@gmail.com
&n=Ruberik.
C would be accessible from the "Add friend" button and a similar URL.
D would be accessible from a similar URL.

Thoughts?
Bartholomew

On Wed, Apr 27, 2011 at 11:26 PM, Ahmed Aly  wrote:

> Yes, I thought about this. But you can't get the nickname given the email,
> or the email given the nickname.
> I think for privacy reasons we can't get the email given the nickname.
> But what about getting the nickname given email (the email which he used to
> register in code jam)?
>
>
> On Wed, Apr 27, 2011 at 9:17 AM, Mohamed Bilal  wrote:
>
>> On 4/27/11, Ahmed Aly  wrote:
>> > Hi everyone,
>> >
>> > This is a question to the admins, but I thought maybe someone else can
>> > answer it.
>> >
>> > I'm going to make a tools website for Google code jam, but some features
>> > need a registration first.
>> > And in the registration you need to enter your Google code jam nickname.
>> > Is there any way to verify that he is the real owner for this nickname?
>> I could think of a way, let's try if it works. If we can get the
>> email-id associated with the google code jam nick name, then you could
>> send a verification mail to the email-id of the user and ask him to
>> verify himself.
>>
>> For this idea, we should be able to retrieve the email id associated
>> with the nick name. Is there any ways to retrieve it?
>> >
>> > --
>> > Best Regards,
>> > Ahmed Aly
>> >
>> > --
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>> >
>> >
>>
>>
>> --
>> Regards,
>>
>> A.Mohamed Bilal
>> http://bilalpc.blogspot.com
>> http://allplacement-papers.blogspot.com
>>
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>
>
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Re: [gcj] Re: minimum scalar

[Bartholomew Furrow]

>
> i don't understand the meaning of this sentence : "Choose two
> permutations such that the scalar product of your two new vectors is
> the smallest possible, and output that minimum scalar product. "
>
> Why two???
>

One permutation for each of the vectors.

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Re: [gcj] How do you avoid frauds?

[Bartholomew Furrow]

>
> What happens if someone registered in the competition sends the
> problems to another person and that person resolves the problem before
> enter to the contest, so the only thing the last person does is to
> upload the code?...
>

No timers start when you start reading a problem, so sharing the problem
text isn't an issue for us.

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Re: [gcj] Minimum Points needed to Qualify Google Code Jam

[Bartholomew Furrow]

This year it's 25.

On Thu, May 5, 2011 at 9:22 PM, Rahul Gulati wrote:

> There is a minimum score that you need in the Qualification round to go to
> the next round.
>
>
> On Thu, May 5, 2011 at 9:49 PM, Satyajit Bhadange <
> satyajit.bhada...@gmail.com> wrote:
>
>> Hi,
>>
>> I was just practicing and saw there was a message written
>> " Minimum 66 points need to  qualify".
>>
>> And i also found that for small input there are 8 points and for large
>> input there are 25 points.
>>
>> Does that mean we should get minimum points to qualify GCJ 2011.
>> Or does it work like FaceBook Hackers Cup Qualification Round.
>>
>>
>>
>>
>> Thanks & Regards,
>> Satyajit Bhadange
>>
>> http://satyajit-algorithms.blogspot.com/
>>
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>
>
>
> --
> Rahul Gulati
> rahul.neot...@gmail.com
> Department of Computer Science
> Jaypee Institute of Information Technology (Deemed University)
> India
>
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Re: [gcj] How do you avoid frauds?

[Bartholomew Furrow]

>
> For me its a challange to my personal skills. If anybody wants to cheat -
> please do, I really do not mind.
>

I mind!  I mind!  Everyone should please feel free *not* to cheat.

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Re: [gcj] Using a different language

[Bartholomew Furrow]

Feel free to use any language you like within the strictures of the rules;
the preferred language that we asked you for is for our interest only.

Good luck!
Bartholomew

On Fri, May 6, 2011 at 1:41 PM, Shay Falador  wrote:

> Dear codejam staff,
> I have a question regarding programming languages in the contest.
> May I use any other programming language other than the one stated on
> my preferred programming language?
> For example, I stated my preferred language as C#, and I may want to
> use PHP, can I do so?
> If so, do I need to mention it anywhere?
>
> Sincerely yours,
> Shay Ben Moshe
>
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Re: [gcj] Regarding MapReduce

[Bartholomew Furrow]

Umer and Marcelo:

Yes, as long as you use freely-available programming languages as described
in the Terms.

Cheers,
Bartholomew

**Actually Visual Studio .NET is fine even though it isn't free -- there's
an exception for that.

On Fri, May 6, 2011 at 12:45 PM, Marcelo Ramires <
marcelo.f.rami...@gmail.com> wrote:

> Not answering the question, but remaining on the topic, adding a couple of
> related questions:
>
> I'm a .NET developer, and every .NET answer I've downloaded has only one
> single file: the default 'program' class of a Console Application with a
> main method.
>
> It this some sort of requirement, or do people do this for efficience and
> speed ?
>
> If I wanted to (say), despite the time that would take, create a visual
> application, with my main class and a 'helper' class, would that be a
> problem ?
>
> Thanks!
>
>
> On Fri, May 6, 2011 at 3:25 PM, Umer Farooq  wrote:
>
>> Can we use MapReduce framework for GCJ?
>>
>> --
>> Umer
>>
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Re: [gcj] Re: Somebody tell me What's wrong of my output Problem-B?

[Bartholomew Furrow]

I'd like to apologize for all the confusion on Magicka.  It seemed that
there were a couple of pain points:

1. Some people thought that all the elements were invoked at the same time,
and then combination and opposition rules were applied once the list was
full.  Thankfully this was refuted by the sample cases, but we got a lot of
questions about it.

2. Many people thought only part of the element list was cleared when there
were opposing elements.  Unfortunately this wasn't refuted by the sample
cases, though it did create an ambiguity in the case 1 QRI 0 4 RRQR that
might have led those people to think you always cancelled with the first
opposing element in the list.

There was a line of text for each of those that, I thought, made it
unambiguous what you were supposed to do; but either one line wasn't enough
to counteract people's intuitive understanding of how the problem should
work, or the lines were ambiguous in some way I don't understand.  If we had
thought of those interpretations, we would definitely have made it more
clear pre-contest; during the contest we added a little extra text, but it
didn't really help to stem the tide of questions.

Bartholomew

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Re: [gcj] Re: Codejam Registrants

[Bartholomew Furrow]

Registration numbers are kind of meaningless, since a lot (no really, a *lot
*) of people sign up but don't show up.  Around 14k competed in some
measurable sense, by downloading at least one input -- I'll put a more exact
number in the editorial when I get the chance.

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Re: [gcj] Google Code Jam Tools Website

[Bartholomew Furrow]

>
> Does anybody know why did ACRush did not participate in the code jam?


http://code.google.com/codejam/contest/scoreboard?c=975485#sp=61

Many stars of last contests were not there.


As João pointed out, you can find some of those people on the Contest
Analysis page, but I'm sure others are missing for other reasons.

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Re: [gcj] Re: Codejam Registrants

[Bartholomew Furrow]

>
> On Sun, May 8, 2011 at 2:34 PM, Vexorian  wrote:

I think that in order to download an input you would need to at least
> think you have solved the problem. Would it be possible to know the
> amount of people that opened the dash board during the contest?
>

That's a fair point.  I'll see if I can figure out that number; we don't
track it in the same way as other things, but I might be able to work it
out.

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Re: [gcj] Goro sort again

[Bartholomew Furrow]

>
> It says Goro is sorting N integers, but not that the integers are
> 1...N.  Are the GCJ question setters being kind by only using arrays
> of 1...N in their test cases?


"""The second line of each test case will contain a permutation of the
*N* smallest
positive integers."""

Did anyone else go through a laborious calculation with increasing
> panic levels as time was running out, only to find that the answers
> always came out as integers?
>

Igor (the problem author) did that too, but without the panic since he had a
little more time. :-)

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Re: [gcj] Problem C output !! Candy problem

[Bartholomew Furrow]

>
> For practice questions, does everyone receive same input ? Or do they give
> different input files every time you download an input set??


Everyone receives the same practice input.

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Re: [gcj] Re: A minor piece of suggestion on GUI of Codejam

[Bartholomew Furrow]

These are some great ideas, and we'll see what we can do about them (though
it's unlikely it will be anything by this weekend).  In the mean time, you
can A) try Chrome, and B) Check the "My submissions" panel post-submission
to make sure you submitted what you thought you did.  If you didn't for a
Small, use Ask a Question to let us know and we can let you resubmit with
only a 4-minute penalty; if you didn't for a Large, just resubmit right away
with the right code (we can't help you through Ask a Question for that).

Cheers,
Bartholomew

On Tue, May 17, 2011 at 7:32 AM, Martín Fixman wrote:

> To be fair, I think it would be simpler to just show a "are you sure you
> want to submit /long/path/to/file" dialog.
>
>
> On Tue, May 17, 2011 at 08:44, Alex Essilfie  wrote:
>
>> In CJ Africa last year, I submitted two wrong source files because of
>> this *glitch*.
>> I now check and double-check before I click on the submit button.
>>
>> It will be a welcome relief if this issue is addressed by the Google
>> team in charge of CodeJam.
>>
>> On May 16, 12:25 pm, Marcelo Ramires 
>> wrote:
>> > Excellent sugestion!
>> >
>> > I've noticed the same thing. Had to check over and over in order not to
>> > submit the wrong files.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Mon, May 16, 2011 at 4:41 AM, Jeru  wrote:
>> > > After we have "Choose File", the text area that contains the path is
>> > > showing the left-most part of the path. Could you modify it a little
>> > > so that it shows the right-most part of the path, because that is more
>> > > informative on which file I have selected?
>> >
>> > > Eg. I submitted two files "/long/path/name/to/CodeJam2011/magicka/
>> > > main.cc" and "/long/path/name/to/CodeJam2011/magicka/B-small-
>> > > attempt0.out". The two text boxes show:
>> > > [/long/path/name/to/CodeJa]
>> > > [/long/path/name/to/CodeJa]
>> > > which are not informative on which files I've put there.
>> >
>> > > If it looks like the follows, i.e., showing the right-most part, it
>> > > will be better.
>> > > [Jam2011/magicka/main.cc]
>> > > [gicka/B-small-attempt0.out]
>> >
>> > > --
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Re: [gcj] Schedule

[Bartholomew Furrow]

The calendar is in Pacific Time, I suppose since that's where the person who
created the calendar is.  I'll see if we can do something about that.

On Tue, May 17, 2011 at 5:50 AM, Pedro Salomão  wrote:

> Hello Guys,
>
> I opened the Schedule for Google Code Jam today and noticed some strange
> thing.
> On the top of the page, we can see a table that says the Round 1-A starts
> on 01:00 UTC.
> But the calendar on the bottom of the page says the same Round 1-A starts
> at 18:00.
> And the same occurs with all dates.
>
> Regards,
>
> --
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Re: [gcj] Re: Codejam Registrants

[Bartholomew Furrow]

Thanks for the reminder.  It looks like 21940 separate logins loaded the
dashboard, and a number of un-logged-in people too.  With that said, not
everybody is a competitor; some people were just there to check out the
problems, because they heard they were so awesome (true story).

Cheers!
Bartholomew

On Tue, May 17, 2011 at 2:55 PM, Pedro Osório wrote:

> Sorry to bother you, did you manage to work it out?
>
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Re: [gcj] Google Code Jam Tools Website

[Bartholomew Furrow]

>
> acrush is not ACRush, GCJ nickname is case sensitive. :)


Same person, new nickname.

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Re: [gcj] IOI 2011

[Bartholomew Furrow]

I wasn't personally aware of that, but there's nothing we can do about it at
this stage.  Did they announce their schedule before ours and have us not
take it into account, or vice versa?

On Sun, May 22, 2011 at 6:35 PM, TripleM  wrote:

> Are the Code Jam organisers aware that the GCJ onsite finals are
> scheduled for the last day of the IOI (http://www.ioi2011.or.th/
> detailed_schedule)? While the 29th is the 'departure day', trying to
> get from Thailand to Japan in a single day, not including a 2 hour
> time difference or time to arrive and get settled, isn't really going
> to be possible.
>
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Re: [gcj] Re: Will the round 1 schedule be adjusted for the rapture?

[Bartholomew Furrow]

Already done: http://code.google.com/codejam/contest/dashboard?c=433101#s=p1
.

Not that I recommend actually reading and trying to solve it; we've improved
our problem-phrasing abilities since then.

On Sun, May 22, 2011 at 4:48 PM, Dalek  wrote:

> That could certainly be a problem to solve in the next Code Jam...
>
>
> On May 22, 2:26 pm, Ram Shanker Saha  wrote:
> > Well said. These so called need do some programming on big integer. So
> that
> > they can say correctly when the world is doing to end.
> >
> > On Sun, May 22, 2011 at 6:15 PM, Bharath Raghavendran
> > wrote:
> >
> >
> >
> >
> >
> > > I guess world was ending in a billion years .. but due to integer
> > > overflow, they calculated it as today
> >
> > > On 22 May 2011 17:28, Alex Essilfie  wrote:
> > > > Well, nothing happened and we're still here so we can assume there
> was
> > > > an error in the 'prediction'.
> >
> > > > Just by the way, did you qualify for the next round?
> >
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Re: [gcj] Re: [Connection problem in round C]

[Bartholomew Furrow]

As you've noticed, the platform sometimes gets a little bumpy at the start
of contests.  This is an improvement over last year, where a couple of times
it got bumpy *during* contests, but still not good enough.  We're going to
work on fixing that or at least ameliorating it; in the mean time, reloading
the page is the best way to get it working if it fails.

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Re: [gcj] GCJ Ratings

[Bartholomew Furrow]

> I don't know why when someone changes his nickname, this change does not
affect the old scoreboard.
> I think if they updated all scoreboards with the latest nicknames, this
will be good too.

We do, except when people change their email addresses rather than just
their nicknames.

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Re: [gcj] Problems statements license

[Bartholomew Furrow]

At this point they're just covered by copyright.  We currently plan to
release problems, analyses and input data under
http://creativecommons.org/licenses/by-nd/3.0, but that hasn't happened just
yet.

The license is NoDerivs, but you will be able to modify problem statements
to reduce them to only one kind of input.  I'd be interested in hearing
input about the license.

Cheers,
Bartholomew

On Thu, Jun 16, 2011 at 8:36 AM, Amahdy  wrote:

> Any response regarding this?
>
> -- Amahdy AbdElAziz
> http://www.linkedin.com/in/amahdyabdelaziz
>
>
>
>
> On Fri, Jun 10, 2011 at 12:56, Marcelo Ramires <
> marcelo.f.rami...@gmail.com> wrote:
>
>> I haven't read it anywhere, but I bet you could integrally copy it as long
>> as you credit Google, as there is a team of Google Engineers who have worked
>> in this..
>>
>> Please, correct me if I am wrong.
>>
>>
>> On Thu, Jun 9, 2011 at 8:41 PM, Sergey Dymchenko wrote:
>>
>>> Hello!
>>>
>>> I'd like to know if I'm allowed to copy or translate Code Jam problem
>>> statements.
>>> May I use the statements texts in my blog post, article or book?
>>>
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Re: [gcj] Re: IOI 2011

[Bartholomew Furrow]

Nika and Others,

Our schedulers will be getting in touch with the IOI participants, and we'll
see what we can do about scheduling the contest so that everyone can make
it.

Cheers,
Bartholomew

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Re: [gcj] Re: Problems statements license

[Bartholomew Furrow]

>
> Please also allow translating to other human languages.
>

Oh, duh!  Great idea.

And why not more liberal license?
>

Fair question.  My initial reaction was to worry about what derivative works
people might create and try to attribute to Google, but I'll consult with
the team and we'll see what we come up with.

Cheers,
Bartholomew

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[gcj] We Have a Winner!

[Bartholomew Furrow]

Out of more than 30,000 registered competitors, only the top 25 made it to
the World Finals in Japan.  After four hours of intense competition, *Japan's
rng..58* has claimed first place, and will receive $10,000 as well as the
title of Code Jam Champion.  He'll keep that title until we meet again at
next year's finals in Paris, France!

Second and Third places, along with their $2000 and $1000 prizes, went to
Belarus's *mystic* and Poland's *meret* respectively.

Thank you to everyone who competed in this year's competition, and
congratulations again to our 2011 Code Jam Champion, winning in his own
country, *rng..58*!

- Bartholomew Furrow, for the Google Code Jam Team

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Re: [gcj] Factorial problem:-

[Bartholomew Furrow]

Mandy,

One thing I'm not sure has been made clear is *why* you're getting an error.

In C++, numbers can be stored in a few different ways.  It sounds to me like
you're using an *int*, which can usually correctly store integers between
about -2 billion and +2 billion.

What happens when you try to store a number more than 2 billion?  Your
program doesn't fail, but it instead does something that might seem strange.
Write a program like the following:

int x = 2147483647;  // The highest number an int can represent
cout << x << endl;
x = x + 1;
cout << x << endl;

Your program will probably output -2147483648.  That's because in C++, your
first number was stored, in binary, as a 32-bit number:
0111
Then when you added 1 to it, you got:
1000

...which is how C++ represents -2147483648 using its two's
complementnotation.
 If you were to keep adding one, you'd eventually get to:

...which is how C++ represents -1.  Add one to that, and you get:

...which is how C++ represents 0.  Notice that in binary, if you added 1 to
that number, it would normally start with a 1:
1
...but C++ only uses 32 bits to store an integer, so it drops the 33rd.

So what you're seeing is an error that comes from the fact that C++ can't
store a number bigger than about 2 billion in an int.  Instead of an int you
can use a *long long*, which can store larger numbers (up to about 9 billion
billion, using 64 bits), but that will only get you up to 20 factorial.
 Look at some of the excellent suggestions in this thread for how to store
numbers larger than that.  As Luke pointed out, for example, the language
Python will automatically use more bits when it needs to; or you could write
a library in C++ that would let you use more bits.

Best,
Bartholomew

P.S. If you look carefully, you'll probably see your program only calculated
up to 13 factorial correctly.  The number it computes for 14 factorial is
actually *smaller*, because C++ couldn't store the larger number, and so it
dropped all the bits after the 32nd bit.  This is called "overflow".  Once
you get to 17!, you'll see that you got a negative number, because bit #32
happened to be 1.

On Wed, Aug 3, 2011 at 1:19 AM, mandy  wrote:

> Can anyone tell me how to compute factorial of 50 in c++ and even for
> bigger no.
> I am getting error(a default value)
>
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Re: [gcj] Code Jam 2012 schedule

[Bartholomew Furrow]

>
> Qualification round on Friday rather than Saturday?


It's the same as 2010 and 2011 -- it starts on Friday in U.S. Pacific time.

It is possible that a significant number of contestants have their wedding
> anniversaries on July 31st.


My understanding is that most of those contestants live in England, which --
according to my sources -- is fairly close to Paris.  I also have reliable
informants telling me that the 31st is, in fact, four days after the 27th.
 I can do some more research on that if you like.

Cheers!
Bartholomew

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Re: [gcj]

[Bartholomew Furrow]

Sorry about the spam, folks.  User banned.

On Fri, Feb 17, 2012 at 12:56 PM,  wrote:

> http://trierstechsvcs.com/wp-content/uploads/trgrpo.html
>
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Re: [gcj] please someone tell me how to solved Korea 2012 Round A

[Bartholomew Furrow]

You can visit the scoreboard, and download the solutions of other
contestants by clicking "솔루션 다운로드".

On Fri, Mar 9, 2012 at 11:45 PM, Minseok Jang  wrote:

> where can I get the solution(not source) that how to solved KOREA 2012
> ROUND A
>
> http://code.google.com/codejam/contest/1378488/dashboard
>
>
>
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Re: [gcj] Translations of Japan-2011 and Korea-2012 Problems

[Bartholomew Furrow]

Hi Jeong,

The licenses for the problems are linked at the bottom of each page.
 Here's the English version:

http://creativecommons.org/licenses/by/3.0/

If you're going to translate the problem, the only requirement (as I
understand the license) is that when you post your translation, you should
mention in your translation that the problem came from Google Code Jam.  Of
course, it's kind of useless if you don't do that anyway, since otherwise
there's no way to test it. :-)

Best,
Bartholomew

On Fri, Mar 9, 2012 at 4:43 AM, Jeong Heon  wrote:

> Hi, I can translate Korea-2012 for you, if you wants, but I wanna know
> about the license issue before translation.
>
>
> 2012/3/4 Khalil Sawant 
>
>> Hi,
>> Is it possible for the organisers to arrange the English translations of
>> the problem statements of CodeJam-Japan-2011 and CodeJam-Korea-2012, for
>> practice purposes.
>>
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[gcj] codejam-annou...@googlegroups.com

[Bartholomew Furrow]

Fellow problem-solvers and coding enthusiasts, we are excited to announce
that registration for Google Code Jam 2012
is now open!

We'll be flying the top 25 contestants to New York City this year to
compete in the World Finals.  So stretch out your wrists, get that kink out
of your neck, and prepare to let your fingers fly!

*Here's how to get started:*

   - Register on the official Code Jam
website (press
   the giant blue button).
   - Read the updated Terms .
   - Check out the FAQ .
   - Practice  using problems
   from previous contests.
   - Read our Quick-Start
Guide.
It will help you understand the format and structure of Code Jam.
   - Also, follow us on Twitter  or
   like us on Facebook .


We'll see you in the Qualification Round, on April
13th
!
- The Code Jam Team

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[gcj] Registration for Google Code Jam 2012 is now open!

[Bartholomew Furrow]

Fellow problem-solvers and coding enthusiasts, we are excited to announce
that registration for Google Code Jam 2012  is
now open!

We'll be flying the top 25 contestants to New York City this year to
compete in the World Finals.  So stretch out your wrists, get that kink out
of your neck, and prepare to let your fingers fly!

*Here's how to get started:*

   - Register on the official Code Jam
website (press
   the giant blue button).
   - Read the updated Terms .
   - Check out the FAQ .
   - Practice  using problems
   from previous contests.
   - Read our Quick-Start
Guide.
It will help you understand the format and structure of Code Jam.
   - Also, follow us on Twitter  or
   like us on Facebook .


We'll see you in the Qualification Round, on April
13th
!
 - The Code Jam Team

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[gcj] Re: Registration for Google Code Jam 2012 is now open!

[Bartholomew Furrow]

P.S. Sorry for the double-send.  Somehow I screwed up the first one.

On Tue, Mar 20, 2012 at 15:08, Bartholomew Furrow  wrote:

> Fellow problem-solvers and coding enthusiasts, we are excited to announce
> that registration for Google Code Jam 2012<http://code.google.com/codejam> is
> now open!
>
> We'll be flying the top 25 contestants to New York City this year to
> compete in the World Finals.  So stretch out your wrists, get that kink out
> of your neck, and prepare to let your fingers fly!
>
> *Here's how to get started:*
>
>- Register on the official Code Jam 
> website<http://code.google.com/codejam> (press
>the giant blue button).
>- Read the updated Terms <http://code.google.com/codejam/terms.html>.
>- Check out the FAQ <http://code.google.com/codejam/faq.html>.
>- Practice <http://code.google.com/codejam/contests.html> using
>problems from previous contests.
>- Read our Quick-Start 
> Guide<http://code.google.com/codejam/quickstart.html>.
> It will help you understand the format and structure of Code Jam.
>- Also, follow us on Twitter <http://twitter.com/#!/googlecodejam> or
>like us on Facebook <http://www.facebook.com/googlecodejam>.
>
>
> We'll see you in the Qualification Round, on April 
> 13th<http://code.google.com/codejam/schedule.html>
> !
>  - The Code Jam Team
>

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[gcj] Changes worth noting for Google Code Jam 2012

[Bartholomew Furrow]

We've made a few changes to the rules and platform for Code Jam from last
year.  Here are some highlights:

- MATLAB is now allowed.  Since Octave and other open-source
implementations exist, it seemed like a good idea.
 - We're no longer restricted by the rules to the format where there's one
Small input and one Large input for every problem.
- The qualification round is now 25 hours instead of 24.
- You can now (as of about 20 minutes ago) change your nickname when
registering, or when on the "Update Profile" page.  We don't encourage this
-- after all, it's the only way all the other contestants know who you are
-- but a lot of people wanted the feature anyway.  This will also update
the nickname on your scoreboard rows in old contests; please let me know if
you have any trouble with this.

Cheers!
Bartholomew

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Re: [gcj] Re: Changes worth noting for Google Code Jam 2012

[Bartholomew Furrow]

Right now we're not showing email addresses, for that very reason.  We're
thinking about how to expose people's performance in a way that potential
employers could verify, though it isn't a high priority right now compared
to, say, preparing the problems for Google Code Jam 2012. :)

Bartholomew

On Wed, Mar 28, 2012 at 9:38 AM, Mort Yao  wrote:

> what, seriously, that's not the feature most people want. there are always
> more spammers than potential employers!
>
> On Wednesday, March 28, 2012 5:54:36 PM UTC+2, vettukal wrote:
>>
>> Will there be option of someone wanting to seeing our email address in
>> the result page. May that will be a good use for reference to future
>> employers..
>>
>> On Friday, March 23, 2012 6:58:43 AM UTC+5:30, Bartholomew Furrow wrote:
>>>
>>> We've made a few changes to the rules and platform for Code Jam from
>>> last year.  Here are some highlights:
>>>
>>> - MATLAB is now allowed.  Since Octave and other open-source
>>> implementations exist, it seemed like a good idea.
>>>  - We're no longer restricted by the rules to the format where there's
>>> one Small input and one Large input for every problem.
>>> - The qualification round is now 25 hours instead of 24.
>>> - You can now (as of about 20 minutes ago) change your nickname when
>>> registering, or when on the "Update Profile" page.  We don't encourage this
>>> -- after all, it's the only way all the other contestants know who you are
>>> -- but a lot of people wanted the feature anyway.  This will also update
>>> the nickname on your scoreboard rows in old contests; please let me know if
>>> you have any trouble with this.
>>>
>>> Cheers!
>>> Bartholomew
>>>
>>  --
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Re: [gcj] Re: Changes worth noting for Google Code Jam 2012

[Bartholomew Furrow]

>
> Yes, that's coming up. You should get on that.
>

Oh man, that's really soon -- do you have any good problem ideas?

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Re: [gcj] Re: Changes worth noting for Google Code Jam 2012

[Bartholomew Furrow]

Thanks,  Barış.  We're on it.

The calendar part.

On Wed, Mar 28, 2012 at 1:32 PM, Baris Acar  wrote:

> I suggest just using last year's problems again, they were pretty good? ;-)
>
> Bartholomew - I notice the google calendar on the website (not the
> schedule table at the top) has all the events down as whole day events -
> would it be possible to update the calendar with more detail?
>
> Barış
>
> On 28 Mar 2012, at 20:44, Bartholomew Furrow  wrote:
>
> Yes, that's coming up. You should get on that.
>>
>
> Oh man, that's really soon -- do you have any good problem ideas?
>
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[gcj] Code Jam hangout

[Bartholomew Furrow]

Hi Code Jammers,

Igor Naverniouk and I will be doing a Hangout On Air on Wednesday, April
4th (tomorrow) at 12:30pm Pacific Time , from the Life
at Google page  on Google+.  If you have questions
you'd like answered, add them to our moderator page .

Igor and I are the primary engineers working on the platform for Code Jam,
which is how we spend our 20% time.  We also do a great deal of work on
problem preparation, and we also have 80% jobs at Google.  If you'd like to
know something about the contest itself, preparing the contest, 20% time,
life at Google, or our backgrounds (Igor and I were teammates in the ACM
ICPC, and in better days we were red on TopCoder), just ask
!

Neither of us has done this before, so this could be an excellent
opportunity to see us embarrass ourselves in one way or another.  I have
some history of saying embarrassing things in interviews (no, I'm not going
to send you a link) so there's some potential there.

Cheers!
Bartholomew

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Re: [gcj] gcj

[Bartholomew Furrow]

Your numbers are a bit low for input and output files -- we let those get
as high as 200kB (the input files can actually be bigger, but max out at
200kB gzipped -- all modern browsers [as far as I can tell] automatically
request a gzipped version from the server).  Bala, for my own information,
how fast is your connection in kB/s?

On Wed, Apr 4, 2012 at 4:58 AM, Amahdy  wrote:

> At the beginning of the competition, due to the very heavy load and number
> of people loading the competition page, there may be a delay not due to
> your internet but due to Google's server load. (Specially in Round1 (A, B,
> & C))
> But other than that, you need to load the question page once (~ 2K),
> download the input files (~5K) and upload yours (~ 5K also). Which I assume
> is good enough over 2G.
>
> p.s. There should be an improvement in the Google's server load, so maybe
> you won't even encounter the firstly mentioned problem.
>
> -- AMahdy!
> www.amahdy.net
>
>
>
> On Wed, Apr 4, 2012 at 13:12, bala subramanian wrote:
>
>> Hi I am using 2g network only.its enough for google code jam or we
>> need high speed for gcj.please give me solution.
>>
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[gcj] Google Code Jam Hangout On Air #2, feat. Petr, Tomek, Onufry

[Bartholomew Furrow]

Code Jammers,

Come join me in about 16 hours for a conversation with international
programming contest superstars Petr Mitrichev and Tomek Czajka, and Code
Jam problem-setter Onufry Wojtaszczyk.  We'll talk about competitive
programming in general, and Code Jam in particular.

The hangout will take place here: http://goo.gl/RtbdD (a post will appear
once it starts)
The time in your local time zone: http://goo.gl/Atj36
Submit your questions here, before or during the hangout:
http://goo.gl/eoWf0

So tune in!  I will do my best to be a lively host, though it will be 8:00
AM here, which is way too early for software engineers.

Bartholomew

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[gcj] Re: Google Code Jam Hangout On Air #2, feat. Petr, Tomek, Onufry

[Bartholomew Furrow]

This has been delayed for a while due to technical difficulties.  We'll
answer some of the Moderator questions on the Google Students G+ page, and
we'll reconvene as soon as we can.

Sorry about that!
Bartholomew

On Tue, Apr 10, 2012 at 3:32 PM, Bartholomew Furrow wrote:

> Code Jammers,
>
> Come join me in about 16 hours for a conversation with international
> programming contest superstars Petr Mitrichev and Tomek Czajka, and Code
> Jam problem-setter Onufry Wojtaszczyk.  We'll talk about competitive
> programming in general, and Code Jam in particular.
>
> The hangout will take place here: http://goo.gl/RtbdD (a post will appear
> once it starts)
> The time in your local time zone: http://goo.gl/Atj36
> Submit your questions here, before or during the hangout:
> http://goo.gl/eoWf0
>
> So tune in!  I will do my best to be a lively host, though it will be 8:00
> AM here, which is way too early for software engineers.
>
> Bartholomew
>

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[gcj] Re: Google Code Jam Hangout On Air #2, feat. Petr, Tomek, Onufry

[Bartholomew Furrow]

OK, we're trying again 24 hours after it was originally supposed to happen.
 In your timezone: http://goo.gl/iYPGd

On Wed, Apr 11, 2012 at 8:31 AM, Bartholomew Furrow wrote:

> This has been delayed for a while due to technical difficulties.  We'll
> answer some of the Moderator questions on the Google Students G+ page, and
> we'll reconvene as soon as we can.
>
> Sorry about that!
> Bartholomew
>
>
> On Tue, Apr 10, 2012 at 3:32 PM, Bartholomew Furrow wrote:
>
>> Code Jammers,
>>
>> Come join me in about 16 hours for a conversation with international
>> programming contest superstars Petr Mitrichev and Tomek Czajka, and Code
>> Jam problem-setter Onufry Wojtaszczyk.  We'll talk about competitive
>> programming in general, and Code Jam in particular.
>>
>> The hangout will take place here: http://goo.gl/RtbdD (a post will
>> appear once it starts)
>> The time in your local time zone: http://goo.gl/Atj36
>> Submit your questions here, before or during the hangout:
>> http://goo.gl/eoWf0
>>
>> So tune in!  I will do my best to be a lively host, though it will be
>> 8:00 AM here, which is way too early for software engineers.
>>
>> Bartholomew
>>
>
>

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Re: [gcj] Final Round - Rules

[Bartholomew Furrow]

Matthew,

We've done our best with Code Jam to make it so that as many people as
possible can participate.  My understanding as a non-lawyer is that lots of
countries have laws regarding how their citizens under the age of 18 are
treated, and because of the effects and variety of these laws, we've been
forced to keep the participation of people aged 13-17 to the online rounds
only.  Your frustration is legitimate, and I'm sorry we don't have a better
answer for it than this -- if it were up to me, everyone in the world would
be eligible to reach the finals.

Regards,
Bartholomew


On Sat, Apr 14, 2012 at 8:33 AM, Matthew Brotzman wrote:

> "ELIGIBILITY. This Contest is open to individuals who are 18 years of
> age or older as of July 22, 2012. Individuals who do not meet that
> requirement but are 13 years of age or older at the time of
> registration may enter the Contest but will only be able to take part
> in the Qualification and Online Rounds as described below. NOTE: If
> you are not 18 or older, you will be ineligible to travel to the
> Onsite Round, though you can still win a t-shirt. "
>
> I can't wait to win that t-shirt, lol.
> I think this rule is very stupid, if there is someone younger then 18
> that can make it to the top, they should be rewarded with something
> much more than a silly t-shirt.
>
> "Congrats, Do not go to New York. Do not collect your $100 prize for
> pacing in the top 25. Very Sorry, Even though you beat many other
> people and haven't lost yet your journey in this competition is over."
> - HOW RUDE.
>
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Re: [gcj] Online IDEs

[Bartholomew Furrow]

If you use ideone, make sure to press the "private" button so nobody else
copies your code during a contest.

On Sun, Apr 15, 2012 at 10:01 AM, teja pratap wrote:

> ideone.com
>
> On Sat, Apr 14, 2012 at 5:56 PM, Prateek Kushwaha
>  wrote:
> > Can anyone suggest a good online IDE where you can run your code ?
> > I got the output of question 3 "Recycled Numbers"- Small part correctly,
> but
> > the large part is taking too long to run and the time expired. Any
> > suggestions ?
> >
> > --
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>
>
>
> --
> Sai Teja Pratap,
> BTech 3rd Year,
> Dept of CSE, IIT Bombay
>
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Re: [gcj] Re: code jam qualification email

[Bartholomew Furrow]

Sorry for the slow emails.  Everyone should have gotten one by now.


2012/4/21 VFIX 

> I guess all the qualified contestants will be receiving a mail ,about
> details for next round 1-2 days before next round.
> In case a contestant didn't advanced for next round he'll be
> receiving a mail mentioning that he haven't qualified for next round .
>
> On Apr 21, 4:52 pm, preetam shivaram  wrote:
> > 60 and still waiting
> >
> > 2012/4/21 tianzhen 
> >
> >
> >
> >
> >
> >
> >
> > > 25 points , haven't received
> >
> > > On 2012-4-21, at 下午7:50, Minseok Jang wrote:
> >
> > > 60pts either do I, I didnt get a mail
> >
> > > 2012/4/21 karan173 
> >
> > >> Hey guys have u recieved d confirmation mail after clearing d 1st
> round
> > >> of code jam. I scored 60 pts but have not yet recieved d mail.
> >
> > >> --
> > >> You received this message because you are subscribed to the Google
> Groups
> > >> "Google Code Jam" group.
> > >> To view this discussion on the web visit
> > >>https://groups.google.com/d/msg/google-code/-/4jECr78jAo4J.
> > >> To post to this group, send email to google-code@googlegroups.com.
> > >> To unsubscribe from this group, send email to
> > >> google-code+unsubscr...@googlegroups.com.
> > >> For more options, visit this group at
> > >>http://groups.google.com/group/google-code?hl=en.
> >
> > > --
> > > You received this message because you are subscribed to the Google
> Groups
> > > "Google Code Jam" group.
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> > > To unsubscribe from this group, send email to
> > > google-code+unsubscr...@googlegroups.com.
> > > For more options, visit this group at
> > >http://groups.google.com/group/google-code?hl=en.
> >
> > > Sincerely,
> >
> > > 田震
> >
> > >  --
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>
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Re: [gcj] Re: code jam qualification email

[Bartholomew Furrow]

Unfortunately we're assuming it's been lost at this point, but we'll let
you know if we are able to retrieve it.

2012/4/26 vivek dhiman 

> Hi Bartholomew
>
> What about the video , that hangout with Petr?
>
>
>
>
> 2012/4/27 Radin Ahmed Ehsan 
>
>> Does that mean that the questions of Round 1 is not ready yet?
>>
>>
>> 2012/4/27 Luke Pebody 
>>
>>> It's probably time to start thinking of questions for round 1.
>>>
>>>
>>>
>>> On 26 Apr 2012, at 23:12, Bartholomew Furrow  wrote:
>>>
>>> Sorry for the slow emails.  Everyone should have gotten one by now.
>>>
>>>
>>> 2012/4/21 VFIX 
>>>
>>>> I guess all the qualified contestants will be receiving a mail ,about
>>>> details for next round 1-2 days before next round.
>>>> In case a contestant didn't advanced for next round he'll be
>>>> receiving a mail mentioning that he haven't qualified for next round .
>>>>
>>>> On Apr 21, 4:52 pm, preetam shivaram  wrote:
>>>> > 60 and still waiting
>>>> >
>>>> > 2012/4/21 tianzhen 
>>>> >
>>>> >
>>>> >
>>>> >
>>>> >
>>>> >
>>>> >
>>>> > > 25 points , haven't received
>>>> >
>>>> > > On 2012-4-21, at 下午7:50, Minseok Jang wrote:
>>>> >
>>>> > > 60pts either do I, I didnt get a mail
>>>> >
>>>> > > 2012/4/21 karan173 
>>>> >
>>>> > >> Hey guys have u recieved d confirmation mail after clearing d 1st
>>>> round
>>>> > >> of code jam. I scored 60 pts but have not yet recieved d mail.
>>>> >
>>>> > >> --
>>>> > >> You received this message because you are subscribed to the Google
>>>> Groups
>>>> > >> "Google Code Jam" group.
>>>> > >> To view this discussion on the web visit
>>>> > >>https://groups.google.com/d/msg/google-code/-/4jECr78jAo4J.
>>>> > >> To post to this group, send email to google-code@googlegroups.com.
>>>> > >> To unsubscribe from this group, send email to
>>>> > >> google-code+unsubscr...@googlegroups.com.
>>>> > >> For more options, visit this group at
>>>> > >>http://groups.google.com/group/google-code?hl=en.
>>>> >
>>>> > > --
>>>> > > You received this message because you are subscribed to the Google
>>>> Groups
>>>> > > "Google Code Jam" group.
>>>> > > To post to this group, send email to google-code@googlegroups.com.
>>>> > > To unsubscribe from this group, send email to
>>>> > > google-code+unsubscr...@googlegroups.com.
>>>> > > For more options, visit this group at
>>>> > >http://groups.google.com/group/google-code?hl=en.
>>>> >
>>>> > > Sincerely,
>>>> >
>>>> > > 田震
>>>> >
>>>> > >  --
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>>>> Groups
>>>> > > "Google Code Jam" group.
>>>> > > To post to this group, send email to google-code@googlegroups.com.
>>>> > > To unsubscribe from this group, send email to
>>>> > > google-code+unsubscr...@googlegroups.com.
>>>> > > For more options, visit this group at
>>>> > >http://groups.google.com/group/google-code?hl=en.
>>>>
>>>> --
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>>>>
>>>>
>>>  --
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[gcj] Sorry for the burst of messages...

[Bartholomew Furrow]

We got our wires crossed, and a bunch of messages that should have been
posted a while ago were stuck in our moderation queue.  Sorry to everyone
whose messages got through late, and to everyone who just got a burst of
less-than-timely messages.

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Re: [gcj] Re: C. Cruise Control Output format question

[Bartholomew Furrow]

FYI: If you use cout, it will not give you 1e-6 precision by default.

On Sat, Apr 28, 2012 at 9:35 PM, sumu...@gmail.com wrote:

> You don't need to worry about outputing exactly the same as the sample
> in the case of floating point.  As they say, if the number you print
> out is within 1E-5 of what is expected, then it is considered
> correct.  In fact you only need one of absolute or relative
> difference, so if the number is really large you get more leeway.
>
> Assuming your algorithm is correct, you can just output the number
> with at least as many decimals as required, and printing out more
> won't hurt.  I usually use 6, but 8 or even 10 would be okay.  One of
> my solutions for problem C was even giving a negative 0 ("-0.00")
> but that was judged okay as well.
>
> In short, pretty-printing floats is something you don't need to worry
> about for GCJ (unless the problem is specifically about that, of
> course).
>
> Some problems don't state it, so from the FAQ:
>
> Two floating point numbers are considered equal if their absolute or
> relative difference is smaller than 1e-6
>
> (unless otherwise stated, so in this case it was 1e-5).
>
>
>
> On Apr 28, 6:26 pm, Carlos Guia  wrote:
> > Use more than 5 and you're safe. Something like %.7f that way you would
> get
> > a bunch 0s and sometimes some low order decimals. But the important thing
> > is that the difference is less than 1e-5.
> >
> > Carlos Guia
> > On Apr 28, 2012 4:43 PM, "Eric Kulcyk"  wrote:
> >
> >
> >
> >
> >
> >
> >
> > > Hello,
> >
> > > I had a partial solution for C coded up, however I wasn't sure how to
> > > format the output correctly.  The problem says the answer for be
> correct to
> > > 1E-5, but the sample output is "1.4"
> > > When I use %.5f or %f, it does 1.4.  I can get it to print 1.4 with
> > > %.2g, however 1.45 outputs as 1.5 when using %.2g.  I tried to code a
> > > solution that detected how many digits were in the solution, but it
> failed
> > > for 120.0025 (it output 1.2e+02).
> >
> > > What's the correct way to do this?
> > > BTW, using printf in java using eclipse.
> >
> > > Thanks,
> > > Eric
> >
> > > --
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> > > "Google Code Jam" group.
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> > >https://groups.google.com/d/msg/google-code/-/colHK14rDqUJ.
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Re: [gcj] i cannot update my profile, why?

[Bartholomew Furrow]

The registration page (which is the same as the 'update profile' page) is
served over https only, so my guess is that you're unable to connect to
https://code.google.com/codejam.  I don't know why that would be -- maybe
something about your proxy settings, or your location?

On Sat, Apr 28, 2012 at 7:28 PM, William Leung  wrote:

> when i click 'update profile', the browser says 'cannot be connected
> to code.google.com'! could somebody tell me why this can happen and
> how i can update my profile?
> sorry for my poor english...
>
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Re: [gcj] Re: what time does round 1B start?

[Bartholomew Furrow]

Whoops!  Sorry about that.  The next contest is now visible.

On Sat, Apr 28, 2012 at 3:34 PM, IdahoJacket  wrote:

> 16:00 UTC on May 5th (next weekend)
>
>
> On Saturday, April 28, 2012 9:38:46 AM UTC-7, juh0 wrote:
>>
>> so they said it would start at 16:00 UTC (http://www.timeanddate.com/
>> worldclock/fixedtime.html?
>> p1=0&year=2012&month=5&day=5&**hour=16&min=0&sec=0)
>>
>> it is 16:36 UTC right now and all i see at GCJ home page is "No
>> upcoming events. [Practice]"
>> what is going on??
>>
>> ps.: my current time is UTC-3 (sao paulo)
>
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[gcj] Are Code Jam emails going through OK?

[Bartholomew Furrow]

I just got a report from a contestant that the email we sent him with his
results from Round 1A got cut off, so he only got a partial message.  Is
this happening to anyone else, or is it a freak occurrence?  We do most of
our mass-email sending through the Code Jam app now, and this is the first
year we've done that, so we're on the lookout for bugs like this.

Bartholomew

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Re: [gcj] Re: Round 1B 2012 amateur analysis (while we wait for the real one)

[Bartholomew Furrow]

The official analysis for this round has just been posted.  Please enjoy
our lengthy explanations and super-consistent formatting!

P.S. Challenge task: See if you can guess which problem's editorial was
written by a math major, using *only the text of the editorial*.

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Re: [gcj] Re: code jam qualification email

[Bartholomew Furrow]

The video has been found!
http://www.youtube.com/watch?feature=player_embedded&v=vQ35aWcjIE0#!

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Re: [gcj] Google Code Jam Hangout On Air #2, feat. Petr, Tomek, Onufry

[Bartholomew Furrow]

The video has finally been found.  Here it is at last!
http://www.youtube.com/watch?v=vQ35aWcjIE0

On Mon, Apr 16, 2012 at 11:05 AM, vivek dhiman wrote:

> Thank You!
>
> On Mon, Apr 16, 2012 at 11:08 PM, Sabrina Welch Joyce 
> wrote:
>
>> Hi Vivek,
>>
>> The video is not ready yet. We should have it up soon!
>>
>> Best,
>> Sabrina
>>
>>
>>
>>
>>
>>
>>
>>
>> Sabrina Joyce (Welch) | Specialist, Industry Programs |
>> sabr...@google.com | 650-253-6317
>>
>> Looking for information about our outreach programs? Check out our Technical
>> Programs & Events site <http://www.google.com/events/technicalprograms/>!
>>
>>
>>
>> On Mon, Apr 16, 2012 at 9:52 AM, vivek dhiman wrote:
>>
>>> Do we have the video uploaded ?
>>>
>>>
>>> On Wed, Apr 11, 2012 at 4:02 AM, Bartholomew Furrow wrote:
>>>
>>>> Code Jammers,
>>>>
>>>> Come join me in about 16 hours for a conversation with international
>>>> programming contest superstars Petr Mitrichev and Tomek Czajka, and Code
>>>> Jam problem-setter Onufry Wojtaszczyk.  We'll talk about competitive
>>>> programming in general, and Code Jam in particular.
>>>>
>>>> The hangout will take place here: http://goo.gl/RtbdD (a post will
>>>> appear once it starts)
>>>> The time in your local time zone: http://goo.gl/Atj36
>>>> Submit your questions here, before or during the hangout:
>>>> http://goo.gl/eoWf0
>>>>
>>>> So tune in!  I will do my best to be a lively host, though it will be
>>>> 8:00 AM here, which is way too early for software engineers.
>>>>
>>>> Bartholomew
>>>>
>>>> --
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>>>>
>>>
>>>
>>>
>>> --
>>> Regards
>>> Vivek Dhiman
>>>
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>
>
>
> --
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> Vivek Dhiman
>
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[gcj] Round 1C's Analysis has been published!

[Bartholomew Furrow]

At long last, the analysis for Round
1C is
available.  Particular thanks to John Dethridge for writing two editorials
and the round editorial!

Bartholomew

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Re: [gcj] Re: Command line tool issues during qualification round

[Bartholomew Furrow]

Sorry, that app's misconfigured.  I suggest using the real qual round to
test for now.

On Fri, Jun 8, 2012 at 9:06 PM, Registered user wrote:

> i m unable to login to link given by u :
>  http://codejam-publictest.appspot.com/codejam/contest/35001/dashboard
>
> how do i login to this :
>
> i dont have LDAP username and password .
>
>
> On Sat, Jun 9, 2012 at 7:42 AM, jbernadas  wrote:
>
>> A new version of the commandline has been pushed into the repository:
>> http://code.google.com/p/codejam-commandline/downloads/list. This new
>> version (1.1-beta1) supports arbitrary I/O sets, which should fix the
>> issues observed during the qualification round.
>>
>> If you want to test the new version before tomorrow you can do it at
>> http://codejam-publictest.appspot.com/codejam/contest/35001/dashboard,
>> which have the qualification round problems with the twist that problem B
>> has two small inputs and one large input. Be aware that the inputs have
>> just a few cases as this is just to test the new commandline tool.
>>
>> The previous version (1.0-beta4) will be deprecated after tomorrow's
>> round. Remember that the previous version only works if all the problems
>> only have small/large inputs. If you find any issues with the new version
>> feel free to open an issue in the project (for some reason I wasn't getting
>> emails about new issues, but I'm going to fix that).
>>
>> Good Luck in Round 3!
>>
>>
>>
>> On Thursday, May 31, 2012 7:13:20 PM UTC-7, jbernadas wrote:
>>>
>>> Sorry for that, my child was born two months ago so I'm not working on
>>> the problems this year. Also, I was on parental leave and missed this
>>> thread. Anyway, my fault.
>>>
>>> *tl;dr: I'm working on a fix to allow the commandline tool to accept
>>> problems with any kind of I/O sets. I think it will be ready for Round 3.
>>> *
>>>
>>> Half of the fix is done which is exposing the required data in the
>>> server. The other half, updating the commandline tool to use this new
>>> information, is complete but it requires some extra testing.
>>>
>>> The issue was that it assumed that all problems have exactly one small
>>> and one large I/O set when parsing the user status and submissions. Did you
>>> try using the -f flag? That flag skips the checks that use that information
>>> and tries to submit directly.
>>>
>>> The new version will not make any kind of assumptions about the I/O
>>> sets, so it should be more robust. The only assumption it will make is that
>>> the only kind of inputs are small and large, which I hope will be more
>>> persistent.
>>>
>>>
>>> On Saturday, April 14, 2012 9:25:51 PM UTC-7, Vexorian wrote:

 I had a couple of issues with the tool during the qualification.
 Wondering if it was just me or if anyone else experienced them.

 I was surprised it did not have any issue downloading and submitting
 problem A, as it has a different format and all that.

 When I tried to solve B, I was able to download B-small and B-large,
 but it would not let me upload. It said that I did not download the test
 case before uploading, so I had to submit manually. The same happened with
 C. I did not even try with D-small.

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Re: [gcj] in java : number of test cases not given , dont mind i m just a begineer, i m here to learn from u all....

[Bartholomew Furrow]

If you're looking to read integers until EOF with Java, try:

while (scan.hasNextInt()) {
  i = scan.nextInt();
  j = scan.nextInt();
  ...
}

You can find out about all the capabilities of scanner at
http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html.



On Thu, May 24, 2012 at 10:54 AM, Registered user
wrote:

> how do i stop processing input
>
> how should i accept this input, no. of test cases not given
>
> i used below code but its giving error... plz help
>
> while(1==1)
> {
> i=scan.nextInt();
> j=scan.nextInt();
>
> //some processing n output
>
>
> }
>
> 1 10
> 100 200
> 201 210
> 900 1000
>
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[gcj] Analysis posted for Round 3

[Bartholomew Furrow]

http://code.google.com/codejam/contest/1835486/dashboard#s=a&a=4

I hope everybody enjoyed the problem set!

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Re: [gcj] World Finals 2012 Analysis

[Bartholomew Furrow]

Hi, folks!  Sorry that took so long -- personally, I was in a Code Jam Coma
brought on by too much problem preparation.  The analysis is now available
at http://code.google.com/codejam/contest/2075486/dashboard#s=a.

Best,
Bartholomew

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Re: [gcj] Re: T-shirt has already sent?

[Bartholomew Furrow]

- It doesn't matter if you're under 18 for purposes of t-shirts.
- If you haven't gotten yours by the end of October, please let us know at
code...@google.com.  We definitely want to make sure everyone gets his or
hers!

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Re: [gcj] How to change email in GCJ ?

[Bartholomew Furrow]

There's currently no way to update your notification email address for Code
Jam -- it's just one of those features that we haven't had time to
implement.  If anyone who wants this feature is coming to work at Google,
I'd love to help you add it; otherwise, we'll try to get to it by 2013 (but
no promises!). :-)

On Thu, Aug 23, 2012 at 8:28 AM, Amtrix  wrote:

> Checked the page: only my gmail account can be seen there as the primary
> address. Sadly, no sight of my hotmail address on the whole page
> Thanks for the try. :)
>
>
> On Thursday, August 23, 2012 2:23:35 AM UTC+2, VincentCarbone wrote:
>>
>> There is drop-down arrow on the side of your image profile. Click that to
>> access the Account setting. From here, Click Google+, and there change the
>> Notification Delivery.  If it is set  to Hotmail, simply change to your
>> Gmail. Cheers
>>
>>>
>>>
>>
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Re: [gcj] Re: T-shirt has already sent?

[Bartholomew Furrow]

> T-shirts are sent to participants that placed in the top 1000. If you did
> so and have not received your t-shirt yet, please email codejam@google.comand 
> include your Code Jam ID name and complete shipping address and we will
> research the status of your t-shirt. We want to be sure everyone receives
> their t-shirt.
> Thank you for your patience.
>

Correction: There's no need to do that quite yet.

We're aware that there are still some shirts -- on the order of 60 -- that
haven't yet made it to their intended recipients.  We're sorry about this,
and we're working hard to make sure the shirts get to you.  We have had a
few delays to ensure we are in compliance with laws around the world, but
we have every intention of getting a shirt to everyone in the top 1000, and
appreciate whatever of your patience may be left. :-)  I'm sorry to
everyone who was expecting a shirt, but hasn't gotten it yet; we're working
on it!

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[gcj] 2013

[Bartholomew Furrow]

Check it out .

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Re: [gcj] Re: 2013

[Bartholomew Furrow]

>
> and members of the Contest Entities' immediate families (parents,
> siblings, children, spouses, and life partners of each, regardless of where
> they live) and members of the Contest Entities' households (whether related
> or not) are ineligible to participate in this Contest
>

Ah, good question.  The previous sentence was actually missing the words
"Contest Entities", and the Terms have been updated to include that.

I would summarize that piece of the Terms as follows (but please bear in
mind that I'm not a lawyer and this is a very loose summary):

If you work at Google (or some other places), you're called a "Contest
Entity", and you can't compete.  Neither can members of Contest Entities'
immediate families, or members of Contest Entities' households.

Thanks for asking!
Bartholomew

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Re: [gcj] In C , how do i create an array of size 10^9 ???

[Bartholomew Furrow]

> I guess you are trying HackerCup problem 3? The truth is...

Please don't discuss problems from contests that are ongoing.

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Re: [gcj] Binary Power (x power y) x,y is very large.

[Bartholomew Furrow]

> @upen, if you working with Java, look at biginteger data type. Google it
up.

For a number that big, an exact representation like BigInteger would be
unwieldy. I'm guessing this needs something custom tailored to the problem
it's being used to solve.

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Re: [gcj] Future of Google Sites?

[Bartholomew Furrow]

This mailing list is the wrong place to ask this question.  A Google search
about Google Sites doesn't show anything to me about it shutting down, so
I'm assuming it isn't. :-)


On Mon, Feb 4, 2013 at 1:35 AM, Rajesh Kumar  wrote:

> Hi!
>   Google will be closing many of its products by 1st Nov, 2013 to promote
> Chrome and Chrome Apps which includes igoogle.com website.
> I have created any gadgets using igoogle platform and imported them on
> google sites platform to create my website
> http://www.wpcpuzzlesonline.com/
> I want to know once Google close igoogle platform what will be future of
> Google Sites. Will Google Sites also be shutdown along with igoogle?
>
> I am trying to find answer of this question from last few months but was
> not able to get any answers to it.
> It will be very helpful If someone from Google on this group can answer
> this question.  If more information on this is required, please do let me
> know?
>
> Regards,
> Rajesh
>
> --
> ..
> Logical Puzzles and Games Online 
> .
> Fun With Puzzles 
>
> --
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Re: [gcj] Hacker Cup Round 2 Question 3

[Bartholomew Furrow]

I didn't end up finishing my implementation, but you're right that it's a
tree.  You can collapse the tree one leaf node at a time.  Each node starts
off with a vector representing sequences that contain only that node: [1].
 When you merge your 1 into your 3, you're merging a [1] with a [1], and
you care about the *position* of the 3.  The merged node looks like (3, [1
0]): you care about the position of the 3, which is in the first position
of 1 permutation that involves those two nodes, and the second position of
0 permutations.  The only permutation looks like (3, x).

Next you can merge the 3 into the 2.  You're merging (2, [1]) with (3, [1
0]); 2>3; and you care about the position of 2 (the non-leaf node).  The
result looks like (2, [0 1 1]): there's one permutation of those three
nodes that has 2 in the second position, one that has it in the third
position, and none in the first.  The permutations look like (x,2,x) and
(2,x,x).

Then merge in the (4, [1]), keeping the 2 (the non-leaf node), which (I
think) looks like (2, [0 2 1 0]).  The permutations now look like (x, 2, x,
x), (x, 2, x, x), (x, x, 2, x).  Finally bring in the 0, which has to be
greater than the 2, and you have (x, 2, x, x, x) * 6, (x, x, 2, x) * 2.
 That's the same as (2, [0, 6, 2, 0, 0]).  A total of 8 permutations.

Cheers,
Bartholomew


On Thu, Feb 14, 2013 at 8:56 AM, Matt Weaver  wrote:

>  Did anyone here manage to get this one?  I've been trying to figure it
> out without any luck. I will copy the problem at the end.
>
> My best guess so far is to consider it a graph with an edge for each
> dependency, then due to their restrictions if you treat the edges as
> undirected the graph forms a tree.  Then do some sort of DP in DFS order to
> get the answer?
>
> I'm stuck on situations like this though:
>
>   0
>   |
>   v
>   2
>  / ^
> v   \
> 34
> ^
> |
> 1
>
> (0 > 2, 2 > 3, 2 < 4, 3 < 1).
>
> One valid permutation is 32041.  Here, 1 is to the right of 2, even though
> it is part of 2's left subtree.
>
> Would appreciate any thoughts.
> --
>
> In this problem you need to count number of possible permutations *p* of
> the first *N* integers, given *N-1* constraints of the form *pi < pj.*
>  Input
>
> The first line contains an integer *T*, *T* ≤ 20, followed by *T* test
> cases. Each test case begins with an integer *N*, *N* ≤ 1000, which is
> the number of integers in the permutation. The next *N - 1* lines each
> contain a single constraint in the following format: "*i* *sign* *j*",
> where 0 ≤ *i*, *j* ≤ *N - 1* and *sign* is either "*<*" or "*>*", which
> denotes whether the *i*-th element of the permutation should be less than
> or greater than the *j*-th element.
>
> It is guaranteed that it is not possible to partition indices into two
> disjoint sets A and B such that there is no constraint involving elements
> from both A and B.
>  Output
>
> For each test case, output one single line with the number of permutations
> that satisfy all the constraints, following the output format shown in the
> example. The answer may be very large, so you should give the result modulo
>  *17*.
>
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Re: [gcj] Hacker Cup Round 2 Question 3

[Bartholomew Furrow]

Thanks for implementing it, Matt -- I'm glad to hear that works!  I got
stuck in the last 40 minutes doing just the binomial part.  I blame
parent-brain.

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Re: [gcj] Solved every last one

[Bartholomew Furrow]

Wow, that's amazing!  Really nice work, Eric, and I'll make sure the rest
of the team sees this.  Congratulations on solving all the problems–it's
good to know that even the really tough ones have had their day in the sun.
 We work hard to minimize the PITA factor, and I'm glad it showed!


On Thu, Feb 21, 2013 at 2:58 PM, Eric G  wrote:

>
> I finally did it.  Every bleeding blanking last one.  Why?  Because they
> were there.
>
> Am I bragging?  Nope.  I took days to solve some of them, even after
> reading the solution editorial.  And some I still don't grok too well
> (partial k-2 trees, seems so easy, but nope...)
>
> All in all, this post is really about thanking those who created the
> problems and reduced as much as possible the PITA factor for the hobbyist
> demographic.  Having a solution rejected with an opaque WA with absolutely
> no indication of where things went wrong is a bit frustrating.
> Whereas here, I generally got as much help as I needed.  It also let me do
> things my way on my PC instead of being forced to use a certain compiler,
> or, god forbid, an applet.  The small dataset is also handy to iron out
> bugs.
>
> So, thanks guys for a great site.  Keep up the good work !
>
> --Eric
>
> ** By every last one, I mean every problem posted on the practice page.
>
>
>
>
>
>
>
>
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Re: [gcj] Regarding output file for submission

[Bartholomew Furrow]

On Mar 9, 2013 7:16 PM, "Amir Hossein Sharifzadeh" <
amirsharifza...@gmail.com> wrote:
>
> During contest time you should first submit the output for grading
> (e.g Hello.out) and after upload a ZIP archive containing multiple
> source code files, as long as their total uncompressed size does not
> exceed 1MB.

Note that if you just have one or a few source files, you don't need to zip
them.

> You NOT should/allowed to submit any kind of executing (exe, dll,
> bat,etc...) files.
>
> Out of contest time (before and after) you may ONLY submit outputs of
> the test cases to be corrected and graded, but not will be ranked.
>
> Please visit the following URL:
> https://code.google.com/codejam/faq.html#mechanics
>
>
>
> On 3/9/13, Mobarak  wrote:
> > Hello, Its my first time participating in Codejam.  I solve a practice
> > problem but i can't submit it. Actually I don't understand which output
> > file(.c,.cpp, .exe ) i have to submit?
> >
> > Thanks
> >
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> >
> >
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Re: [gcj] Regarding Knowledge

[Bartholomew Furrow]

Speaking in Tongues isn't a great problem to start with, because it's a
little bit unusual and silly.  I'd recommend looking at the "Where should I
start?" section on our Practice & Learn
Page and
solving the ones listed there, from top to bottom.  The first problem is Store
Credit .


On Mon, Mar 11, 2013 at 12:13 PM, Zoebali Maknojia <
zoebali.makno...@gmail.com> wrote:

> Hello everybody,
>Today i got to know about Google Code Jam and
> started my practice with the qualification round of 2012 named "Speaking in
> Tonges".Actually i found it difficult and tried to understand it but
> couldn't solve it moreover i got the solution then also i couldn't found it
> usefull so can any tell me some other usefull sites where i can practice
> such kind of problems and can horn my programming skills.Please help as i m
> new in this I.T. world.Thanks.
>
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Re: [gcj] Algorithms

[Bartholomew Furrow]

> I think Computational Geometry and Dynamic Programming are most important
> for GCJ.


Oh man, we must be doing something wrong. :-P  I don't think we've asked
for much computational geometry before.  There have been a few problems
like that, but I think not more than one or two a year.


>
>
> On Wed, Mar 13, 2013 at 12:09 PM, Pranav Kulkarni wrote:
>
>> Hi all,
>> I was studying algorithms types, there are lots of them. But, i was
>> curious about whether there are some specific set of algorithms that
>> can solve any problem that may come?
>>
>> On 13/03/2013, Lokesh Khandelwal  wrote:
>> > According to some statistics, Java takes about twice as much time as
>> > equivalent C.
>> >
>> > And algo complexties remain the same. They dont just change because you
>> are
>> > coding in a difffernt language.
>> >
>> > I have coded in java for more about 2 years regualarly in differnt
>> coding
>> > platforms like Codechef, codeforces and topcoder. And the problem
>> setters
>> > keep in mind that the user can submit codes in this langauge (or even
>> > python which is more slower) ans set time limits appropiately.
>> >
>> > As far as GCJ is concerned, u have to download a Input file, run it on
>> your
>> > local system and give the output file+source code (in small size input u
>> > get 4 min and in large u get 8 mins) . If your algo is correct your code
>> > will never take more than about 5secs to give the output of all the
>> tests.
>> >
>> > On Wednesday, March 13, 2013, Pranav Kulkarni wrote:
>> >
>> >> i love to code in java. But,
>> >> what about complexity of algo?
>> >> And also about time constrains applied in the event? Do u think java
>> >> will not be a problem?
>> >>
>> >> On 13/03/2013, Lokesh Khandelwal 
>> wrote:
>> >> > I have been coding in java since high school and so i am accustomed
>> to
>> >> > that. It offers much more in built features than C and also object
>> >> oriented
>> >> > , so C is RIP . Cant say same for C++ though.
>> >> >
>> >> > Also I find handling pointers difficult. It is a personal choice. You
>> >> > can
>> >> > choose which ever language., Its practice that gets you going in it.
>> >> >
>> >> > On Wednesday, March 13, 2013, Pranav Kulkarni wrote:
>> >> >
>> >> >> this is really helpful. I have a question, as c, c++ are quiet more
>> >> >> efficient than java. Why do u prefer java? I mean same algo on c is
>> >> >> faster than in java.
>> >> >>
>> >> >> On 13/03/2013, Lokesh Khandelwal 
>> >> >> wrote:
>> >> >> > I personally use Java. For that I use IntelliJ Idea as an editor
>> >> >> > with
>> >> >> > EgorK's Chelper plugin configured. That helps me generate tasks
>> for
>> >> >> contest
>> >> >> > and makes testing codes quite easy and quick. Also the auto gen
>> code
>> >> >> > feature in it helps code quickly(although this is present on most
>> >> >> > Java
>> >> >> > editors like eclipse and netbeans)
>> >> >> >
>> >> >> > When I need to switch to C/C++ i use codeblocks .
>> >> >> >
>> >> >> > On Wednesday, March 13, 2013, Pranav Kulkarni wrote:
>> >> >> >
>> >> >> >> does lang makes difference?
>> >> >> >>
>> >> >> >> On 13/03/2013, Pranav Kulkarni  wrote:
>> >> >> >> > I prefer, c, but sometimes i switch between, c, c++, java. I
>> know
>> >> >> >> > all
>> >> >> >> > three, bcoz of my acadamics.
>> >> >> >> >
>> >> >> >> > On 13/03/2013, Lokesh Khandelwal <
>> lokesh.khandelwa...@gmail.com>
>> >> >> wrote:
>> >> >> >> >> Which language do u code in ?
>> >> >> >> >>
>> >> >> >> >> On Wednesday, March 13, 2013, Pranav Kulkarni wrote:
>> >> >> >> >>
>> >> >> >> >>> yeah, but my setup may be not good enough. I have seen in
>> other
>> >> >> >> >>> even
>> >> >> >> >>> people just submits there code in first five mins. While i m
>> >> >> >> >>> just
>> >> >> >> >>> starting my editor (quiet a funny though). What setup they
>> >> >> >> >>> might
>> >> >> >> >>> be
>> >> >> >> >>> using this was my curiosity?
>> >> >> >> >>>
>> >> >> >> >>> On 13/03/2013, Lokesh Khandelwal
>> >> >> >> >>> >
>> >> >> >> >>> wrote:
>> >> >> >> >>> > You can use absolutely any OS , any editor.All they need is
>> >> >> >> >>> > the
>> >> >> >> source
>> >> >> >> >>> code
>> >> >> >> >>> >  and the output file.
>> >> >> >> >>> > It is recommended to use that language in which you excel,
>> >> >> >> >>> > and
>> >> >> that
>> >> >> >> >>> editor
>> >> >> >> >>> > in which you practice the most.
>> >> >> >> >>> >
>> >> >> >> >>> > You can to the practice link and try solving some
>> problems. I
>> >> >> >> >>> > feel
>> >> >> >> >>> > Introduction to Algorithms by Cormen is the best book
>> >> available.
>> >> >> >> >>> > But theoretical knowledge doesnt help here. You need to
>> keep
>> >> >> >> >>> > practicing.
>> >> >> >> >>> >
>> >> >> >> >>> > Good luck!!!
>> >> >> >> >>> >
>> >> >> >> >>> > On Wednesday, March 13, 2013, Pranav Kulkarni wrote:
>> >> >> >> >>> >
>> >> >> >> >>> >> Hello all,
>> >> >> >> >>> >>
>> >> >> >> >>> >> Its my first time in online coding contest. I was worr

Re: [gcj] Output File for all QR problems

[Bartholomew Furrow]

Unfortunately I don't have a convenient way of getting those for you.
 You'd be best off downloading the practice input files for each problem,
downloading the round winner's code for the Larges, and generating the
output.  Some of them will have FP numbers in them, so you'll need to
accept approximate equality the way we do.


On Wed, Mar 20, 2013 at 12:39 PM, Bassel Safwat wrote:

> I am holding a code jam warm up contest in my faculty and we need the
> output files for old QR problems. Is there a way to get them all directly
> ?? (instead of downloading one by one)
>
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Re: [gcj] Errors from official Code Jam calendar?

[Bartholomew Furrow]

Thanks for pointing that out, Guillermo!  I think we've fixed the times now
-- would you mind double-checking?


On Tue, Apr 9, 2013 at 11:16 AM, Guillermo  wrote:

> Are other people also seeing this problem on the official Code Jam
> calendar?
> The calendar is at
> https://code.google.com/codejam/schedule.html
>
> At the bottom it says that it is showing the events in my time zone - US
> Pacific time.
> But, some are shown in the wrong time,
> and the error persists when using the link that allows adding the event to
> our personal calendar.
>
> For example, Online Round 1: Sub-Round A is shown as starting at "Sat,
> April 27, 6:00pm – 8:20pm"
> But the schedule at the top of the page shows it at "Saturday, April 27,
> 2013  01:00 UTC", that is, 6 pm PDT on Friday, April 26.
>
> A similar discrepancy also occurs for Online Round 1: Sub-Round B
>
> The other entries do not show this discrepancy.
>
> Does anyone else see this?
>
>
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[gcj] Contest Analysis for Round 1A has been posted

[Bartholomew Furrow]

You can find the analysis at
https://code.google.com/codejam/contest/2418487/dashboard#s=a.  Enjoy!

Bartholomew

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Re: [gcj] Disqualification

[Bartholomew Furrow]

All right, I think I've tracked down the bug!

First, my apologies to everyone who got an email saying he or she had been
disqualified.  That's a nasty surprise.  I'd also like to apologize to
the *entirely
different set* of people who then got an email saying "Don't worry, you
haven't been disqualified!", which was probably also quite confusing.  I
sent an email to all contestants after that, because without knowing what
had gone wrong, there was no other way to make sure I reached everyone who
had gotten the erroneous email.

Since this was a bug that affected our users, it seems only fair that I
tell you about it.  If you don't want to read a story about tracking down a
difficult-to-reproduce bug, this is a good time to stop reading.

*The background*
Code Jam runs on App Engine.  The email-sending service is something like a
hand-rolled MapReduce, implemented one summer by an excellent intern who
should feel free to chime in and take credit.  It's supposed to work this
way:
- An admin sets up a "notification" object, which gets written to the App
Engine datastore and to memcache.  It has a time at which it will
automatically start sending.
- Emails will be sent to the set of all users who were eligible to
participate in a given contest, but has a list of "filters" that restrict
that set, which are stored in the notification's "unprocessed_filters"
field.  For example, a filter could require that the field "rule_breaker"
appears in a user's scoreboard row, or it could require that user's rank be
<= 1000.
- When that time arrives, the first thing that happens is that filters are
"processed".  "Rank <= 1000" becomes "(Points, Time) >= (36, 45:50)". The
other filter remains unchanged. Both are stored in the "processed_filters"
field of the notification, and the modified "notification" object gets put
back into memcache and datastore.
- Mappers go and fetch the "notification" object from memcache (or, if that
fails, datastore) and send email accordingly.

One more piece of background: our library that stores objects in
memcache+datastore uses a local cache, which is *supposed* to be cleared at
the start of every request.

*What happened*
The library that stores objects in memcache+datastore *wasn't* cleared at
the start of the Mapper jobs.  On App Engine, a series of requests
automatically gets sent to various machines.  So if the following series of
events takes place:
- Machine A sets up the notification, and caches it locally.
- Machine B does the filter processing.
- Machine A acts as a Mapper, without clearing the local cache.

...then Machine A will look in its local cache, and find the old version of
the notification: the one that has unprocessed filters, but no processed
filters.  It will think, "Should I send this email to user X?  Well, I
don't have any filters, so I should."

This bug was really tough to track down.  I disabled mail-sending, added a
lot of debug logging, and then wrote a bunch of test emails, then sent them
off one by one; it took me ten tries to get one that failed in this
particular way.  Once I realized that the field was unset, I started
wondering about whether App Engine's datastore or memcache could be giving
old versions of the data; but then I remembered the local cache.  I checked
the logs to see whether when multiple Mappers failed in the same MapReduce,
it was always on the same machine; and it was.

*The immediate fix*
1. Go through all request handlers and make sure our local cache is cleared
properly.  Add a comment to those lines saying that they must appear in new
handlers.  I'm fairly confident that will prevent this from happening
again, because I expect people to do a certain amount of copy/pasting when
they make new handlers.
2. Add an assertion, before any filters are evaluated, to make sure
len(notification["processed_filters"]) ==
len(notification["unprocessed_filters"]).  Now even if another bug occurs
that causes filters not to be propagated, this should catch it.

I hope this was interesting!  Expect the final emails from Round 1A today,
and please let me know if you got the wrong one. :-)
- Bartholomew

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Re: [gcj] Disqualification

[Bartholomew Furrow]

> Expect the final emails from Round 1A today

I'm going to delay until the morning to send them out, so I'll be awake to
deal with it just in case something goes wrong.  If you want to know
whether you advanced, though, check your rank in Round 1A.  If it's <=
1000, you advanced!  If not, we'll see you in 1B and 1C!

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Re: [gcj] Disqualification

[Bartholomew Furrow]

Hi Stanislav,

I don't want to go into *much* detail, but I will share an anecdote.

Last year, in the qualification round, we ended up needing to disqualify
hundreds of people.  Why?  Because they didn't know they weren't supposed
to collaborate, or didn't know they were supposed to compete with multiple
accounts, or they wrote their code on an insecure machine and it was stolen
by an idiot "friend," or they ran their code on Ideone and didn't turn on
the privacy settings, and some jerk stole it.  That's no fun for anybody,
so we changed the rules this year.  Of course there were some genuine,
deliberate rule-breakers in there, but if you need to break the rules to
get through the Qualification Round, you aren't going to knock anybody out
in Round 2.

This year we had the option to ignore that stuff in the qualification
round.  So instead of sending out hundreds of emails saying "You've been
disqualified for reason X", and then having dozens or hundreds of unhappy
people, we got to send out hundreds of emails saying "We think you might
have accidentally broken the rules for reason X, but we could be wrong.  Be
careful not to do X in the next rounds!".

That makes *everyone* happier.
Bartholomew



On Fri, May 3, 2013 at 7:07 AM, Stanislav Zholnin <
stanislav.zhol...@gmail.com> wrote:

> Bartholomew,
>
> Just out of curiosity - how prevalent are disqualifications? My
> understanding that they are not needed at all in QR, but the close you get
> to Finals, the more time should be reasonably spent on testing contestants
> compliance with rules (probably some algorithm which determines closeness
> of contestants solutions using some AI-class algorithm + some analysis of
> submission times).
>
> If you think that it's better to not get into details on disqualifications
> to not tempt people in trying to break rules wihtout getting caught - I
> would understand that. Compliance by obscurity actually does work in
> contrary to security by obscurity. :)
>
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Re: [gcj] Re: Disqualification

[Bartholomew Furrow]

> Note that in any case, Bart should never send "DISQUALIFIED".

LOL! :-)

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Re: [gcj] Disqualification

[Bartholomew Furrow]

> Makes a lot of sense. The thing which participant must understand and not
> be offended is that many of situations you described are indistinguishable
> from one another. Person who said that his source was stolen and who
> participated in a good faith can not be distinguished from person who did
> it intentionally. Same with person who "forgot to attach source, but here
> it is, I can send it now" - cannot be distinguished from person who used
> his friend code to come up with output file and then created some
> supporting code after the competition.
> So some people's feeling can be hurt, because they didn't really try to
> cheat and didn't do anything intentionally wrong. But they must understand
> that nobody can provide a proof for that and that's why rules are as strict
> as they are.
>

That's pretty much the problem.  And the rules say that you can't share
your code, even by accident.  That's why I'm so happy with this year's
changes: fewer bruised feelings, and less frustration, due to accidents.


I agree with your comment that if to get 35 points in Qualifiers you need
> to cheat, then 100% you shouldn't try doing it at all.


That's actually not what I meant to say: what I meant was that if you need
to break the rules to pass through the Qualifiers, it isn't going to have a
real effect on other contestants, because you aren't going to place in the
top 1000 in Round 1X; so we don't really need to care.  On a personal
level, as far as I'm concerned if you want to show up to the qualification
round and break those rules just to have fun, I don't mind.  It's when you
do that in a later round, and prevent someone else from advancing, that I
personally have a problem.


People reminded about rules, code of conducts, (they even did ten
> commandments) right before the activity are much less likely to cheat.
> Maybe this is one of the idea you should look into - instead of showing
> blank screen for 2 hours before competition, put there summary of
> participation rules in regards to cheating, with tickmark at the bottom.
>

That's a fantastic idea!  We'll definitely think about whether we can do
that in a friendly way.


I will be doing it with timer on my own. I would really option for ability
> to still participate in the round in a "Shadow mode" meaning all as usual,
> but not being included in rankings. So if you get to this at some point -
> that would be nice.
>

That would be pretty cool, but unfortunately it has to be prioritized
against other things (like making cool problems, and sending emails to the
right people).  You should apply to Google, then make it happen!  :-)

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Re: [gcj] Re: Top 25

[Bartholomew Furrow]

> Good job meret for not finishing in first 25. As he has his place in
finals secured, we will have opportunity for 26 people in final round.

Unfortunately, that rule doesn't take effect until next year.

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[gcj] Re: Homepage shows "Coding is now in progress"

[Bartholomew Furrow]

> coding was over weeks ago.

You didn't stop coding, did you???

We'll update it. :-)  The finalists aren't done coding yet, but I'm sure we
can come up with something new before the finals.

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Re: [gcj] Help me to learn Cloudera

[Bartholomew Furrow]

Hi karthikeyan,

I'm afraid this isn't the right mailing list to ask this question.

Best,
Bartholomew


On Mon, Jul 8, 2013 at 7:28 AM, karthikeyan balamurugan wrote:

> Guys i want to learn and develop Cloud technology using some open source
> Hadoop and Bigdata
> How to i start
> Give me some suggestions
>
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Re: [gcj] Homepage shows "Coding is now in progress"

[Bartholomew Furrow]

OK, you can all stop coding now .


On Sat, Jul 6, 2013 at 8:30 AM, Andres Felipe Ruiz  wrote:

> I think (And this is a serious response) that that message is shown as far
> as GCJ is still running. I mean, After the finals ends, that would
> dissapear.
>
>
>
>
> On Sat, Jul 6, 2013 at 7:27 AM, Luke Pebody  wrote:
>
>> Coding Never Sleeps
>>
>> Sent from my iPad
>>
>> On 5 Jul 2013, at 18:31, Radin Ahmed Ehsan 
>> wrote:
>>
>> Hi,
>>
>> There is slight error in the text of the home page where it shows "*Coding
>> is now in progress*" although coding was over weeks ago.
>>
>> I am attaching a screen shot with this mail for reference.
>>
>> --
>> Regards,
>>
>> Radin
>>
>> Blog: https://radinehsan.wordpress.com
>>
>> "Here's to the crazy ones, the misfits, the rebels, the troublemakers,
>> the round pegs in the square holes... the ones who see things differently -
>> - they're not fond of rules... You can quote them, disagree with them,
>> glorify or vilify them, but the only thing you can't do is ignore them
>> because they change things... they push the human race forward, and while
>> some may see them as the crazy ones, we see genius, because the ones who
>> are crazy enough to think that they can change the world, are the ones who
>> do."
>> --  Steve Jobs 
>>
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Re: [gcj] Request for Displaying the Coding language used by each contestant in the contest scoreboard

[Bartholomew Furrow]

> You can use go-hero http://www.go-hero.net/jam/13

That's what I always do. While it isn't official, foxlit has done a great
job of maintaining the site over the years and making it a useful resource
for everyone.

> Note that this not a trivial problem to recognise all languages - some
people attempt to use ridiculous languages to solve these things.

You don't happen to know anybody like that, do you, Luke?

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Re: [gcj] Anyone received the T-shirt?

[Bartholomew Furrow]

My understanding is that we're still working on sending out the shirts, so
the answer is probably "not yet" from everybody. :-)


On Wed, Jul 24, 2013 at 11:03 PM, Jinfu Leng  wrote:

> Thanks.
>
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Re: [gcj] 2013 Finals analysis published

[Bartholomew Furrow]

Leandro,

We can't really discuss why particular finalists didn't attend; it seems
impolite to pass on that kind of information, even if it isn't terribly
exciting. Sorry!

Bartholomew


On Fri, Sep 6, 2013 at 5:11 PM, Leandro Coutinho wrote:

> Hi Petr.
>
> Could you answer my question here, please?
> https://groups.google.com/forum/#!topic/google-code/36wJvrplduQ
> Maybe you know why tourist didn't attend the finals. Many were waiting to
> see his performance at the finals (you too, from an old post:
> http://petr-mitrichev.blogspot.com.br/2009/10/gennady-korotkevich.html =),
> so it's said that he didn't participate ... :/
> Thank you.
>
>
> On Fri, Sep 6, 2013 at 4:07 PM, Petr  wrote:
>
>> The analysis for the final round is up at
>> https://code.google.com/codejam/contest/2437491/dashboard#s=a
>>
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Re: [gcj] Code of conduct

[Bartholomew Furrow]

What an intriguing proposition! I don't think that's something we've
thought about. Have you pledged only to attend events with Codes of
Conduct? Events without them? Events with Codes of Conduct that require
adherents to wear silly hats?


On Wed, Feb 26, 2014 at 10:02 AM, Vexorian  wrote:

> I've been wondering if the on site finals have or will have a Code of
> Conduct. I may have made a "CoC Pledge" the other week, so it would be
> improtant for me to know if I am going to participate in this tournament
> this year :)
>
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