I was stunned to see how fast, and on pausing, how beautiful Marshall's
were. Very unusual and powerful uses of insert.
I doubt you'll find a much faster J solution than:
,(+/~10&*)/ 4#,:>:i.6
or the uglier but slightly quicker
,+// (10<.@^i._4)*/>:i.6
But the problem is structural, not numeric, which attracted me to catalog.
On 10/4/2017 6:28 PM, 'Skip Cave' via Programming wrote:
I was stunned by Cliff's cool use of catalog (catalogue?) I had not really
grasped the capabilities of the monadic use of '{' on boxed arguments. I
had always used { dyadically as 'from'
2 { 1 2 3
3
This was a revelation:
{2#<'123'
┌──┬──┬──┐
│11│12│13│
├──┼──┼──┤
│21│22│23│
├──┼──┼──┤
│31│32│33│
└──┴──┴──┘
Skip
Skip Cave
Cave Consulting LLC
On Tue, Oct 3, 2017 at 10:21 PM, Cliff Reiter <[email protected]> wrote:
A cheat (?) that builds instead of "removing"
z=.,".>{4#<'123456'
$z
1296
10{.z
1111 1112 1113 1114 1115 1116 1121 1122 1123 1124
On 10/3/2017 4:16 PM, Skip Cave wrote:
Another interesting Quora problem:
Given the integers from 1000 to 9999, remove all integers that contain a
7,
8, 9, or zero, and list the remaining integers.
Skip
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