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.
s思路： 1. 移位就可以了！
class Solution {public: int hammingWeight(uint32_t n) { // int res=0; for(int i=0;i<32;i++){ if(n==0) break;//優化的不錯：判斷是否提前就等于0了，后面的操作就不必做了 res+=n&1; n>>=1; } return res; }};新聞熱點
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