Ex 1.2

using System;
using System.Collections.Generic;

namespace SandBox
{
    public class Program
    {
        static void Main(string[] args)
        {
            string guessedWord = Console.ReadLine();
            string attempt = Console.ReadLine();

            if (attempt != null && guessedWord != null)
            {
                int N = guessedWord.Length;
                HashSet<int> lettersUsedNumbers = new HashSet<int>();
                string[] answer = new string[N];
                Dictionary<char, int> countLetters = new Dictionary<char, int>();

                for (int i = 0; i < N; i++)
                {
                    if (countLetters.ContainsKey(guessedWord[i]))
                    {
                        countLetters[guessedWord[i]]++;
                    }
                    else
                    {
                        countLetters.Add(guessedWord[i], 1);
                    }
                    if (guessedWord[i] == attempt[i])
                    {
                        answer[i] = "correct";
                        countLetters[guessedWord[i]]--;
                    }
                }

                for (int i = 0; i < N; i++)
                {
                    if (guessedWord[i] != attempt[i])
                    {
                        if (countLetters.ContainsKey(attempt[i]) && countLetters[attempt[i]] > 0 && guessedWord[i] != attempt[i])
                        {
                            answer[i] = "present";
                            countLetters[attempt[i]]--;
                        }
                        else
                        {
                            answer[i] = "absent";
                        }

                    }

                }

                for (int i = 0; i < N; i++)
                {
                    Console.WriteLine(answer[i]);
                }
            }
        }
    }
}