Given an integer, write a function to determine if it is a power of two.
My initial code:
1 class Solution: 2 # @param {integer} n 3 # @return {boolean} 4 def isPowerOfTwo(self, n): 5 if n==0 : 6 return False 7 if n==1 or n==2: 8 return True 9 if n % 2 != 0: 10 return False 11 if n < 4 and n 12 return self.isPowerOfTwo(n/2)
After google the internet, the best solution is:
class Solution: # @param {integer} n # @return {boolean} def isPowerOfTwo(self, n): if n<= 0 or n&(n-1) != 0: return False return True
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