题解 | 单组_二维数组

/**
    10^3 * 10^3 * 10^9 = 10^12
    使用 long
 */

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 count = in.nextInt() * in.nextInt();
        long sum = 0;
        while(count>0){
            sum += in.nextInt();
            count--;
        }
        System.out.println(sum);
    }

    public static void m1(){
        Scanner in = new Scanner(System.in);        
        int n = in.nextInt();
        int m =in.nextInt();
        long sum = 0;
        for(int i=0; i<n; i++){
            for(int j=0; j<m; j++){
                sum += in.nextInt();
            }
        }
        System.out.println(sum);
    }
}