[191] Number of 1 Bits

奇怪我記得我有寫過count bit 啊 XD

偷渡同樣的題目

速度看起來差不多？！

#if 1

int hammingWeight(uint32_t n) {

int ret=0;

while(n>0)

{

ret += n&1;

n=n>>1;

}

return ret;

}

#else

int hammingWeight(uint32_t n) {

int ret=0;

while(n)

{

ret++;

n&=(n-1);

}

return ret;

}

#endif