Created
November 26, 2013 21:22
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import math | |
f = open('input.in') | |
cases = int(f.readline()) | |
for case in range(cases): | |
m = [ ] | |
lines = int(f.readline()) | |
# read and convert the matrix | |
s = 0 | |
for i in range(lines): | |
m.append([1 if j == '#' else 0 for j in f.readline()]) | |
s += sum(m[-1]) | |
# get what might be the length of a side | |
sum_on_a_line = int(math.sqrt(s)) | |
# get first row with a black cell | |
while not filter(None, m[0]): | |
m.pop(0) | |
# get left right indices | |
l = [i for i, x in enumerate(m[0]) if x] | |
left = l[0] | |
right = l[-1] + 1 | |
# sum up the portion of the matrix where the square | |
# should be | |
new_sum = 0 | |
for line in m: | |
if sum_on_a_line != sum(line[left : right]): | |
break | |
else: | |
new_sum += sum_on_a_line | |
# test to see if the new_sum equals the old one | |
if new_sum == s and sum_on_a_line * sum_on_a_line == s: | |
print "Case #%s: YES" % (case + 1) | |
else: | |
print "Case #%s: NO" % (case + 1) |
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