342 Power of Four
342. Power of Four
题目： https://leetcode.com/problems/power-of-four/
难度 : Easy
继续照抄power of three
class Solution(object):
def isPowerOfFour(self, num):
"""
:type num: int
:rtype: bool
"""
if num <= 0 :
return False
if num == 1:
return True
if num % 4 == 0:
return self.isPowerOfFour(num/4)
return False
