Problem

Given a square matrix, calculate the absolute difference between the sums of its diagonals.

For example, the square matrix  is shown below:

1 2 3
4 5 6
9 8 9  

The left-to-right diagonal = 1 + 5 + 9 = 15 . The right to left diagonal =
3 + 5 + 9 = 17 . Their absolute difference is |15 – 17| = 2 .

Function description

Complete only diagonalDifference function in the editor below. It must return an integer representing the absolute diagonal difference.

diagonalDifference takes the following parameter:

• arr: an array of integers .

Input Format

The first line contains a single integer, n , the number of rows and columns in the matrix .
Each of the next  n  lines describes a row, arr[i] , and consists of  n space-separated integers arr[i] [j].

Output Format

Print the absolute difference between the sums of the matrix’s two diagonals as a single integer.

Sample Input

3 --------> n
11 2 4
4 5 6
10 8 -12

Sample Output : 15

Explanation

The primary diagonal is:

11
   5
     -12

Sum across the primary diagonal: 11 + 5 – 12 = 4

The secondary diagonal is:

     4
   5
10

Sum across the secondary diagonal: 4 + 5 + 10 = 19 
Difference: |4 – 19| = 15

Note: |x| is the absolute value of x

Code to get input

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Solution {
    // Complete the diagonalDifference function below.
    static int diagonalDifference(int[][] arr) {

    }

    static void Main(string[] args) {
        TextWriter textWriter = new StreamWriter(@System.Environment.GetEnvironmentVariable("OUTPUT_PATH"), true);

        int n = Convert.ToInt32(Console.ReadLine());

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

        for (int i = 0; i < n; i++) {
            arr[i] = Array.ConvertAll(Console.ReadLine().Split(' '), arrTemp => Convert.ToInt32(arrTemp));
        }

        int result = diagonalDifference(arr);

        textWriter.WriteLine(result);

        textWriter.Flush();
        textWriter.Close();
    }
}