bearophileH!
I gave to your "oil" svrl runs ("z in dict" instd of "dict.has_key"
saved only ~0.4 sec).
The result is (and I'm completely lost in all these
*optimizations* :)):
>>> ================================ RESTART ===
>>>
0
34.78 secs (bearophileH)
>>> ================================ RESTART ===
>>>
0
34.77 secs (bearophileH)
>>> ================================ RESTART ===
>>>
0
34.76 secs (bearophileH)
>>> ================================ RESTART ===
>>>
0
27.2460938471 secs (n00m)
>>> ================================ RESTART ===
>>>
0
27.2953596058 secs (n00m)
>>> ================================ RESTART ===
>>>
0
27.3709929614 secs (n00m)
>>>
In the name of exactness this is the tested codes:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
from collections import defaultdict
import time, psyco
def main():
sch = 0
q,w,e,r = [],[],[],[]
h = defaultdict(int)
datafile = file("D:/m4000.txt")
datafile.next()
xrows = (map(int, line.split()) for line in datafile)
q, w, e, r = zip(*xrows)
for x in q:
for y in w:
h[x+y] += 1
for x in e:
for y in r:
if -x-y in h:
sch += h[-x-y]
print sch
t = time.clock()
psyco.full()
main()
print round(time.clock() - t, 2), "secs (bearophileH)"
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
import psyco, time
def main():
q,w,e,r,sch,h = [],[],[],[],0,{}
f = open("D:/m4000.txt","rt")
for o in range(int(f.readline())):
row = map(int, f.readline().split())
q.append(row[0])
w.append(row[1])
e.append(row[2])
r.append(row[3])
f.close()
for x in q:
for y in w:
if (x+y) in h:
h[x+y] += 1
else:
h[x+y] = 1
for x in e:
for y in r:
if -(x+y) in h:
sch += h[-(x+y)]
q,w,e,r,h = None,None,None,None,None
print sch
t = time.clock()
psyco.full()
main()
print time.clock() - t,"secs (n00m)"
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
PS Both Python & Psyco of 2.5 ver.
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