C# Diagonal Difference [HackerRank]

C# Diagonal Difference [HackerRank]

 

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
{
    public static int diagonalDifference(List<List<int>> arr)
    {
        //리스트 크기 반복
        int a=0, b=0;
        for(int i=0; i<arr.Count; i++)
        {
            //a는 오른쪽으로 b는 왼쪽으로 가면서 더함
            a += arr[i][i];
            b += arr[i][arr.Count-1-i];
        }
        
        //a-b가 0보다 크면 그대로 작으면 -1 곱해서 반환
        if(a-b>0)
        {
            return a-b;
        } 
        else
        {
            return (a-b) * -1;    
        } 
    }

}

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();
    }
}