Adv2015/D05.1/Program.cs

using System;
using System.IO;

namespace D05._1
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 1) throw new ArgumentException();
            if (File.Exists(args[0]) == false) throw new FileNotFoundException();

            int goodStrings = 0;
            using (var file = File.OpenText(args[0]))
            {
                while (true)
                {
                    var line = file.ReadLine();
                    if (line == null) break;

                    if (IsGoodString(line)) goodStrings++;
                }
            }

            Console.WriteLine($"The answer is : {goodStrings}");
        }

        private static bool IsGoodString(string line)
        {
            int vowels = 0;
            int repeted = 0;
            bool isBad = false;
            char last = '\0';
            foreach (var c in line)
            {
                if (c == 'a' || c == 'o' || c == 'i' || c == 'e' || c == 'u') vowels++;
                if (c == last) repeted++;

                if ((last == 'a' && c == 'b') || (last == 'c' && c == 'd') || (last == 'p' && c == 'q') || (last == 'x' && c == 'y'))
                {
                    isBad = true;
                    break;
                }

                last = c;
            }

            return isBad == false && repeted > 0 && vowels >= 3;
        }
    }
}