03. Man O War

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

namespace ManOWar
{
    class Program
    {
        static bool IsIndexValid(int i, List<int> l)
        {
            return i >= 0 && i < l.Count;
        }
        static void Main(string[] args)
        {
            var pirateShip = Console.ReadLine().Split('>').Select(int.Parse).ToList();
            var warShip = Console.ReadLine().Split('>').Select(int.Parse).ToList();
            int maxSectionHealth = int.Parse(Console.ReadLine());
            string input;

            while ((input = Console.ReadLine()) != "Retire")
            {
                var tokens = input.Split(' ');
                string command = tokens[0];

                if (command == "Fire")
                {
                    int index = int.Parse(tokens[1]);
                    if (IsIndexValid(index, warShip))
                    {
                        int damage = int.Parse(tokens[2]);
                        warShip[index] -= damage;
                        if (warShip[index] <= 0)
                        {
                            Console.WriteLine("You won! The enemy ship has sunken.");
                            warShip.Clear();
                            break;
                        }
                    }
                }
                else if (command == "Defend")
                {
                    int startIndex = int.Parse(tokens[1]);
                    int finalIndex = int.Parse(tokens[2]);
                    if (IsIndexValid(startIndex, pirateShip) && IsIndexValid(finalIndex, pirateShip))
                    {
                        int damage = int.Parse(tokens[3]);
                        for (int i = startIndex; i <= finalIndex; i++)
                        {
                            pirateShip[i] -= damage;
                            if (pirateShip[i] <= 0)
                            {
                                Console.WriteLine("You lost! The pirate ship has sunken.");
                                pirateShip.Clear();
                                Environment.Exit(0);
                            }
                        }
                    }
                }
                else if (command == "Repair")
                {
                    int index = int.Parse(tokens[1]);
                    if (IsIndexValid(index, pirateShip)) {
                        int health = int.Parse(tokens[2]);
                        pirateShip[index] += health;
                        if (pirateShip[index] > maxSectionHealth)
                        {
                            pirateShip[index] = maxSectionHealth;
                        }
                    }
                }
                else if (command == "Status")
                {
                    int count = pirateShip.Where(x => x < maxSectionHealth / 5).Count();
                    Console.WriteLine($"{count} sections need repair.");
                }
            }

            if (pirateShip.Count > 0 && warShip.Count > 0)
            {
                Console.WriteLine($"Pirate ship status: {pirateShip.Sum()}\nWarship status: {warShip.Sum()}");
            }
        }
    }
}