leetcode Number of 1 Bits
Number of 1 Bits
10進位制數轉化為二進位制數1的個數
解題思路：n=n&n-1 每一次會消去一個1，只需要統計這個操作出現的次數就可以了。
例如：
n = 0x110100 n-1 = 0x110011 n&(n - 1) = 0x110000
n = 0x110000 n-1 = 0x101111 n&(n - 1) = 0x100000
n = 0x100000 n-1 = 0x011111 n&(n - 1) = 0x0
public static void main(String[] args) { int n=11; int result = hammingWeight(n); System.out.println(result); } public static int hammingWeight(int n) { int count=0; while(n!=0){ n=n&n-1; count++; } return count; }
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