static void Main(string[] args)
{
var lines = System.IO.File.ReadAllLines("input.txt");
Dictionary <HexCo, bool> tiles = new Dictionary <HexCo, bool>();
foreach (var line in lines)
{
var hex = HexCo.GoPath(line);
if (!tiles.ContainsKey(hex))
{
tiles[hex] = true;
}
else
{
tiles[hex] = !tiles[hex];
}
}
int result = 0;
foreach (var pair in tiles)
{
if (pair.Value)
{
result++;
}
}
Console.WriteLine(result);
}
public static HexCo GoPath(string path)
{
var result = new HexCo();
while (path != String.Empty)
{
int chars = 1;
if (path.StartsWith("s") || path.StartsWith("n"))
{
chars = 2;
}
result.Inc(path.Substring(0, chars));
path = path.Substring(chars);
}
return(result);
}
protected bool Equals(HexCo other)
{
return(X == other.X && Y == other.Y);
}