leetcode------Reverse Bits

标题：	Reverse Bits
通过率：	27.6%
难度：	简单

Reverse bits of a given 32 bits unsigned integer.

For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as00111001011110000010100101000000).

Follow up:
If this function is called many times, how would you optimize it?

Related problem: Reverse Integer

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

这个题还是思路还是比较明确的。需要注意的就是补位的问题，给的数据不一定都是32位，所以要补位，本题我用的python，

直接代码：

 1 class Solution:
 2     # @param n, an integer
 3     # @return an integer
 4     def reverseBits(self, n):
 5         tmp=bin(n)
 6         tmp=tmp[2:]
 7         if len(tmp)!=32:
 8             for a in range(32-len(tmp)):
 9                 tmp='0'+tmp
10         tmp=tmp[::-1]
11         return int(tmp,2)