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(), m = in.nextInt();
        long sum = 0;
        // 按照题目要求使用数组的做法
        int[][] nums = new int[n][m];
        for (int h=0; h<n; h++) {
            for (int w=0; w<m; w++) {
                nums[h][w] = in.nextInt();
            }    
        }
        for (int[] outside:nums) {
            for (int inside:outside) {
                sum+=inside;
            }
        }

        /* 邪修版 
        for (int i=0; i<n; i++) {
            for (int l=0; l<m; l++) {
                sum += in.nextInt();
            }
        }
        */

        System.out.println(sum);
    }
}