AdventOfCode23/Day23/PathEdge.cs

namespace Day23;

public record PathEdge(PathNode Start, PathNode End, List<Tile> Tiles)
{
    private static int _count = 0;

    private PathEdge? _inverted;
    
    public int Id { get; private set; } = ++_count;

    public PathEdge Invert()
    {
        if (_inverted == null)
        {
            _inverted = new PathEdge(End, Start, Enumerable.Reverse(Tiles).ToList()) { _inverted = this };
        }

        return _inverted;
    }
}