本文共 395 字,大约阅读时间需要 1 分钟。
比较快的是,a&(a-1)
class Solution {public: vector countBits(int num) { vector ans; ans.push_back(0); for(int i=1;i<=num;i++){ int a = i; int sum = 1; int b = a&(a-1); while( b != 0){ //printf("<%d %d>\n",a,a-1); sum ++; a = b; b = a&(a-1); } ans.push_back(sum); } return ans;}};
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