题解 | 单组_二维数组

import java.util.Scanner;

// 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) {
        Scanner in = new Scanner(System.in);

        int m = in.nextInt(); //hang
        int n = in.nextInt(); //lie

        long res = 0;
        for (int i = 0; i < m; i++) {

            long count = 0;
            for (int j = 0; j < n; j++) {

                count = count + in.nextInt();

            }

            res = res + count;
        }

        System.out.print(res);

    }
}