View Code of Problem 51

import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
          	int n=scan.nextInt();
          	int[][] arr=new int[n][n];
          int sum=0;
          	
          for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
              arr[i][j]=scan.nextInt();
              
            }
          }
          
          for(int i=0;i<n;i++){
            for(int j=0;j<i;j++){
              sum=sum+arr[i][j];
              
            }
          }
          
         System.out.println(sum);
          	
          	
        }
}

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