Learn Contest Programming

Array.Sort(v,StringComparer.InvariantCulture); or, v = v.OrderBy(x => x).ToArray();

ans = ans.Remove(ans.Length - 1);

In C++ we have map. In C# the equivalent of map is Dictionary. However it's not sorted. So we use SortedDictionary instead. Following is an example of mapping. using System; using System.Collections.Generic; namespace PracticeApp {     class Program     {         static void Main(string[] args)         {             var s = Console.ReadLine()?.Split('+');             var myDictionary = new SortedDictionary<int, int>();             foreach (var item in s)             {                 int a = int.Parse(item);                 myDictionary.TryGetValue(a, out var x);                 myDictionary[a] = x + 1;             }       ...