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C++实现LeetCode(191.位1的个数)

程序员文章站 2022-03-10 21:00:15
[leetcode] 191.number of 1 bits 位1的个数write a function that takes an unsigned integer and returns the...

[leetcode] 191.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;
    }
};

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