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leetcode------Bitwise AND of Numbers Range

时间:2015-04-23 17:21:34      阅读:173      评论:0      收藏:0      [点我收藏+]

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标题: Bitwise AND of Numbers Range
通过率: 25.7%
难度: 中等

Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.

For example, given the range [5, 7], you should return 4.

就是将区间内的所有数字按位与的结果,如果按照每个数字的去与,那么是超时的,直接贴出代码把。。这个只能生办硬套:

 1 class Solution:
 2     # @param m, an integer
 3     # @param n, an integer
 4     # @return an integer
 5     def rangeBitwiseAnd(self, m, n):
 6         offset=0
 7         while m !=n :
 8             m>>=1
 9             n>>=1
10             offset+=1
11         return m<<offset

 

leetcode------Bitwise AND of Numbers Range

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原文地址:http://www.cnblogs.com/pkuYang/p/4451050.html

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