Snowmen(ExamTask02)05.01.18

using System;
using System.Collections.Generic;
using System.Linq;

namespace Snowmen
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            List<int> snowmen = Console.ReadLine().Split(' ').Select(int.Parse).ToList();

            HashSet<int> loosers = new HashSet<int>();

            while(snowmen.Count > 1)
            {
                for (int attacker = 0; attacker < snowmen.Count; attacker++)
                {
                    if (!loosers.Contains(attacker))
                    {
                        if (snowmen[attacker] >= snowmen.Count)
                        {
                            int target = snowmen[attacker] % snowmen.Count;
                            int diff = Math.Abs(attacker - target);
                            if (attacker == target)
                            {
                                Console.WriteLine("{0} performed harakiri", attacker);
                                loosers.Add(attacker);
                            }
                            else if (diff % 2 == 0)
                            {
                                Console.WriteLine("{0} x {1} -> {2} wins", attacker, target, attacker);
                                loosers.Add(target);
                            }
                            else
                            {
                                Console.WriteLine("{0} x {1} -> {2} wins", attacker, target, target);
                                loosers.Add(attacker);
                            }
                        }
                        else
                        {
                            int target = snowmen[attacker];
                            int diff = Math.Abs(attacker - target);
                            if (attacker == target)
                            {
                                Console.WriteLine("{0} performed harakiri", attacker);
                                loosers.Add(attacker);
                            }
                            else if (diff % 2 == 0)
                            {
                                Console.WriteLine("{0} x {1} -> {2} wins", attacker, target, attacker);
                                loosers.Add(target);
                            }
                            else
                            {
                                Console.WriteLine("{0} x {1} -> {2} wins", attacker, target, target);
                                loosers.Add(attacker);
                            }

                        }
                        if (snowmen.Count - loosers.Count == 1)
                        {
                            return;
                        }
                    }
                }
                foreach (var index in loosers)
                {
                    snowmen[index] = -1;
                }
                loosers.Clear();
                snowmen = snowmen.Where(x => x != -1).ToList();
            }
        }
    }
}