题解 | 单组_二维数组

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int raw = in.nextInt();
        int col = in.nextInt();
        long sum = 0;
        for (int i = 0; i < raw; i++) {
            for (int j = 0; j < col; j++) {
                sum += in.nextInt();
            }
        }
        System.out.println(sum);
    }
}