MinimumAbsoluteDifference.cs

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 minimumAbsoluteDifference(List<int> arr)
    {
        arr.Sort();
        
        var minDiff = int.MaxValue;
        
        for (var i = 1; i < arr.Count; i++) 
        {
            var diff = Math.Abs(arr[i -1] - arr[i]);
            
            if (minDiff > diff) minDiff = diff;
        }
        
        return minDiff;
    }
}

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<int> arr = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arrTemp => Convert.ToInt32(arrTemp)).ToList();

        int result = Result.minimumAbsoluteDifference(arr);

        textWriter.WriteLine(result);

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