Minimum Loss - Woman codesprint - study code - simpler and smarter than my solution

MinimumLoss_StudyCode_1.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {
    static void Main(String[] args) {
        int len = Convert.ToInt32(Console.ReadLine());
        long[] a = Console.ReadLine().Split(' ').Select(long.Parse).ToArray();

        Dictionary<long, int> dict = new Dictionary<long, int>();
        for (int i = 0; i < len; i++){
            dict.Add(a[i], i);
        }
        
        long min = long.MaxValue;
        Array.Sort(a);
        for (int i = len - 1; i > 0; i--){
            long diff = a[i] - a[i - 1];
            if (diff < min && dict[a[i]] < dict[a[i - 1]])
                min = diff;
        }
        Console.WriteLine(min);
    }
}