【第一部分】09Leetcode刷题

一、位1的个数

题目：191. Number of 1 Bits

C++ Soution 1:

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;
    }
};

二、第k个排列

 题目：60. Permutation Sequence

C++ Soution 1: