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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester
{
    public class Program
    {
        //public static void Main(string[] args)
        //{
            //Your code goes here
           // Console.WriteLine("Hello, world!");
        //}
        public static void Main(string[] args)
        {
            List<int> notes = new List<int>();
            List<int> amounts = new List<int>() { 50,100,200 };
            //
            // Compute change for 51 cents.
            //
            Change(notes, amounts, 0, 0, 250);
        }
    
        static void Change(List<int> notes, List<int> amounts, int highest, int sum, int goal)
        {
            //
            // See if we are done.
            //
            if (sum == goal)
            {
                Display(notes, amounts);
                return;
            }
            //
            // See if we have too much.
            //
            if (sum > goal)
            {
                return;
            }
            //
            // Loop through amounts.
            //
            foreach (int value in amounts)
            {
                //
                // Only add higher or equal amounts.
                //
                if (value >= highest)
                {
                List<int> copy = new List<int>(notes);
                copy.Add(value);
                Change(copy, amounts, value, sum + value, goal);
                }
            }
        }
    
        static void Display(List<int> notes, List<int> amounts)
        {
            foreach (int amount in amounts)
            {
                int count = notes.Count(value => value == amount);
                Console.WriteLine("{0}: {1}",
                amount,
                count);
            }
            Console.WriteLine();
        }
    }
}

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Compilation time: 0.14 sec, absolute running time: 0.11 sec, cpu time: 0.09 sec, average memory usage: 15 Mb, average nr of threads: 4