aoc-day4

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

namespace Day4
{
    internal class Program
    {
        private static bool isHavingSameAdjacentNumber(int number)
        {
            var numberStr = number.ToString();
            for (int i = 0; i < numberStr.Length - 1; i++)
            {
                if (numberStr[i] == numberStr[i + 1])
                    return true;
            }
            return false;
        }

        private static bool IsNotMoreTwoDigitsAdjacent(int number)
        {
            Dictionary<char, int> d = new Dictionary<char, int>();
            var numberStr = number.ToString();
            for (int i = 0; i < numberStr.Length; i++)
            {
                if (d.ContainsKey(numberStr[i])) d[numberStr[i]]++;
                else d.Add(numberStr[i], 1);
            }
            return d.Values.Any(v => v == 2);
        }

        private static bool isIncreasing(int number)
        {
            var numberStr = number.ToString();
            for (int i = 0; i < numberStr.Length - 1; i++)
            {
                if (numberStr[i] > numberStr[i + 1]) return false;
            }
            return true;
        }

        private static bool test(int number)
        {
            bool[] tests = { isIncreasing(number), isHavingSameAdjacentNumber(number), IsNotMoreTwoDigitsAdjacent(number) };
            return tests.All(i => i == true);
        }

        private static void Main(string[] args)
        {
            var min = 183564;
            var max = 657474;
            var count = 0;

            for (int number = min; number <= max; number++)
            {
                if (test(number)) count++;
            }

            Console.WriteLine(count);
        }
    }
}