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[][] a=new int[n][n];
          for(int i=0;i<n;i++)
          {
            for(int j=0;j<n;j++)
            {
              a[i][j]=scan.nextInt();
            }
          }
          
          int sum=0;
          
          for(int i=0;i<n;i++)
          {
            for(int j=0;j<i;j++)
            {
              sum=sum+a[i][j];
            }
          }
          System.out.println(sum);
        }
}

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