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 n = in.nextInt();
        int m = in.nextInt();

        long sum=0;
        for (int i = 0; i < n; i++) {
            int[] a = new int[m];
            for (int j = 0; j < m; j++) {
                sum+= in.nextInt();
            }
        }
        System.out.println(sum);
    }
}