Number of 1 Bits
给个整数, 数一. 因为是Integer,所以一共32位. 1 << i 就是每个位上的1.
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public class Solution { // you need to treat n as an unsigned value public int hammingWeight(int n) { int res = 0; for(int i = 0 ; i < 32; i++) { if((n & (1 << i)) != 0) res++; } return res; } } |