Dirty.cs

using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;

namespace DIrtyWars
{
    [TestFixture]
    public class TestFixture
    {
        [Test]
        public void Test()
        {
            const string input = @"5 5
1 2 N
LMLMLMLMM
3 3 E
MMRMMRMRRM";

            var lines = input.Split(new[] {'\n', '\r'}, StringSplitOptions.RemoveEmptyEntries);

            Action<Action<int>> x2 = a =>{ a(0); a(1); };
            Func<IEnumerable<string>, int[]> atois = ss => ss.Select(int.Parse).ToArray();

            var bs = new[] {'N', 0, 1, 'E', 1, 0, 'S', 0, -1, 'W', -1, 0};
            var ds = new[] {'M', 0, 'L', -1, 'R', 1};

            var mx = atois(lines[0].Split(' '));

            for (var i = 1; i < lines.Length; i += 2)
            {
                var l0 = lines[i].Split(' ');

                var p = atois(l0.Take(2));
                var b = Array.IndexOf(bs, l0[2][0]);

                foreach (var di in lines[i + 1].Select(c => Array.IndexOf(ds, c)))
                {
                    x2(d => p[d] += bs[b + 1 + d]*(di == 0 ? 1 : 0));
                    b += ds[di + 1]*3;
                    b = b < 0 ? bs.Length - 3 : b == bs.Length ? 0 : b;
                    x2(d => p[d] = Math.Max(0, Math.Min(mx[d], p[d])));
                }

                Console.WriteLine("{0} {1} {2}", p[0], p[1], (char) bs[b]);
            }
        }
    }
}