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xeonqq/Equi.py

Created September 8, 2015 13:34
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Find an index in an array such that its prefix sum equals its suffix sum.
Raw
Equi.py
def solution(A):
# write your code in Python 2.7
s = []
tmp = 0
n = len(A)
for a in A:
tmp = a + tmp
s.append(tmp)
s.append(0)
for i in xrange(0,n):
if s[i-1] == s[n-1]-s[i]:
return i
return -1
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