题解 | 多组_二维数组_T组形式

import java.util.Scanner;


public class Main {
    public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       int t  = sc.nextInt();
        for(int i = 0;i < t;i++){
        int n = sc.nextInt();
        int m = sc.nextInt();
        long a[][] = new long[n][m];
        long sum = 0;
         for(int j = 0;j<n;j++){
            for(int k = 0;k < m;k++){
                a[j][k] = sc.nextLong();
                sum = sum + a[j][k];
                }
       }
       System.out.println(sum);

        }
        sc.close();
      
      
   }
}