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[LeetCode] Number of 1 Bits 位1的个数

 

 

Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should return 3.

 

很简单的一道位操作Bit Manipulation的题,最近新出的三道题都没有啥难度啊,这样会误导新人的,做了这三道得出个LeetCode没啥难度的结论,其实里面好题真的不少,难题也很多,经典题也多,反正就是赞赞赞,32个赞。

 

class Solution {
public:
    int hammingWeight(uint32_t n) {
        int res = 0;
        for (int i = 0; i < 32; ++i) {
            res += (n & 1);
            n = n >> 1;
        }
        return res;
    }
};

 

LeetCode All in One 题目讲解汇总(持续更新中...)

posted @ 2015-03-10 11:11 Grandyang 阅读(...) 评论(...) 编辑 收藏