Adv2016/D03.2/Program.cs

using System;
using System.IO;
using System.Linq;

namespace D03._2
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length < 1) throw new ArgumentException();
            if (File.Exists(args[0]) == false) throw new FileNotFoundException();

            int answer = 0;

            var all = File.ReadAllText(args[0]).Split('\n', StringSplitOptions.RemoveEmptyEntries)
                .Select(a => a.Split(' ', StringSplitOptions.RemoveEmptyEntries).Select(s => int.Parse(s)).ToArray());
            var lines = all.Select(a => a[0]).Concat(all.Select(a => a[1])).Concat(all.Select(a => a[2])).ToList();

            for (int i = 0; i < lines.Count; i += 3)
                answer += lines[i] + lines[i + 1] > lines[i + 2] && lines[i] + lines[i + 2] > lines[i + 1] && lines[i + 1] + lines[i + 2] > lines[i] ? 1 : 0;

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