SOExample, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Dictionary<char, int> timesRepeated = new Dictionary<char, int>();
            string encodeme = "BOOOM";
            
            foreach (char ch in encodeme.Replace(" ", string.Empty))
            {
                if (timesRepeated.ContainsKey(ch))
                {
                    timesRepeated[ch] = timesRepeated[ch] + 1;
                }
                else
                {
                    timesRepeated.Add(ch, 1);
                }
            }
            
            foreach(KeyValuePair<char, int> item in timesRepeated.OrderByDescending(i => i.Value).ThenBy(i => i.Key))
            {
                char key = item.Key;
                int count = item.Value;
                Console.WriteLine(key.ToString() + " : " + count.ToString());
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,39 sec, absolute running time: 0,13 sec, cpu time: 0,14 sec, average memory usage: 19 Mb, average nr of threads: 4, absolute service time: 0,55 sec