C# Fundamentals - 02. TheLift - MidExam 12.08.2020

using System;
using System.Linq;

namespace _02._TheLift
{
    class TheLift
    {
        static void Main(string[] args)
        {
            int people = int.Parse(Console.ReadLine());
            int[] liftSpots = Console.ReadLine()
                              .Split()
                              .Select(int.Parse)
                              .ToArray();

            bool isEmpty = false;
            int drive = people;

            for (int i = 0; i < liftSpots.Length; i++)
            {
                if (liftSpots[i] == 4)
                {
                    continue;
                }

                if (people == 0)
                {
                    if (liftSpots[i] < 4)
                    {
                        isEmpty = true;
                    }
                    break;
                }

                for (int j = 0; j < 4; j++)
                {
                    if (liftSpots[i] == 4 || people == 0)
                    {
                        break;
                    }

                    people -= 1;
                    liftSpots[i] += 1;
                }

                if (liftSpots[i] < 4)
                {
                    isEmpty = true;
                }
            }

            if (isEmpty)
            {
                Console.WriteLine("The lift has empty spots!");
                Console.WriteLine(string.Join(' ', liftSpots));
            }

            else if (people > 0)
            {
                Console.WriteLine($"There isn't enough space! {people} people in a queue!");
                Console.WriteLine(string.Join(' ', liftSpots));
            }

            else
            {
                Console.WriteLine(string.Join(' ', liftSpots));
            }
        }
    }
}