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peroon/問題.py

Created March 14, 2017 16:20
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問題.py
def call():
print('call')
for i in range(0, N):
for j in range(i+1, N):
call()
# Q. callは何回呼ばれるか？
# A. N-1, N-2, ..., 1の和なので、(N-1) * N / 2
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