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| class Solution(object):
def myPow(self, x, n):
"""
:type x: float
:type n: int
:rtype: float
"""
if n == 0:
return 1.0 # 返回float
elif n < 0:
return 1 / self.myPow(x, -n)
elif n % 2: # 结果为1，奇数
return self.myPow(x*x,n/2)*x
else: # 偶数
return self.myPow(x*x,n/2)
|