题解 | 二进制不同位数

import java.util.Scanner;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        StreamTokenizer in = new StreamTokenizer(br);

        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        in.nextToken();
        int m = (int) in.nval;

        in.nextToken();
        int n = (int) in.nval;

        int count = 0;

        int x = m^n;
        
        while (x != 0) {
            x &= x - 1;
            count++;
        }
        out.println(count);

        out.flush();
        out.close();
        br.close();
    }
}