Square Matrix - Corner Elements Sum

              Square Matrix - Corner Elements Sum

A square matrix of size N×N is passed as the input. The program must calculate and print the sum of the elements in the corners.

Input Format:
The first line will contain the value of N.
The next N lines will contain the N values separated by one or more spaces.

Output Format:
The first line will contain the integer value denoting the sum of the elements in the corners.

Boundary Conditions:
2 <= N <= 20

Example Input/Output 1:
Input:
3
10 90 1
4  22 5
32 8 66

Output:
109

Explanation:
The sum = 10+1+66+32 =  109

Code:

import java.util.*;

public class Hello {

    public static void main(String[] args) {

                   Scanner sc=new Scanner(System.in);

                   int i,j,n,sum=0;

                   n=sc.nextInt();

                   int[][] arr=new int[n][n];

                   for(i=0;i<n;i++)

                       {

                          for(j=0;j<n;j++)

                           {

                               arr[i][j]=sc.nextInt();

                              if((i==0&&j==0)||(j==0&&i==n-1)||(i==0&&j==n-1)||(i==n-1&&j==n-1))

                                   sum+=arr[i][j];

                           }

                       }

    System.out.print(sum);

          }

}

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