为什么我的结果少1
sum = 0
x = 1
n = 1
while True:
x = x+2**(n-1)
n += 1
if n >20:
break
sum +=x
print sum
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sum = 0
x = 1
n = 1
while True:
x = x+2**(n-1)
n += 1
if n >20:
break
sum +=x
print sum
2019-07-09
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