C++实现位1的个数 C++实现LeetCode(191.位1的个数)
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[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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