diagonal-difference.cs

// Diagonal difference 😊
// https://www.hackerrank.com/challenges/diagonal-difference/problem

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 Result
{

    /*
     * Complete the 'diagonalDifference' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts 2D_INTEGER_ARRAY arr as parameter.
     */

    public static int diagonalDifference(List<List<int>> arr)
    {
        int diag1 = 0;
        int diag2 = 0;

        int row1 = 0;
        int col1 = 0;

        int row2 = 0;
        int col2 = arr.Count - 1;

        for(int i =0; i<arr.Count; i++)
        {
            diag1 += arr[row1][col1];
            diag2 += arr[row2][col2];

            row1 +=1; col1 +=1;
            row2 +=1; col2 -=1;            
        }

        return Math.Abs(diag2-diag1);
    }

}

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

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

        List<List<int>> arr = new List<List<int>>();

        for (int i = 0; i < n; i++)
        {
            arr.Add(Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arrTemp => Convert.ToInt32(arrTemp)).ToList());
        }

        int result = Result.diagonalDifference(arr);

        textWriter.WriteLine(result);

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