using System.Collections.Generic;
using System.Linq;

namespace Assets.Map
{
    public class Graph<T>
    {
        public List<T> Vertices { get; internal set; } = new List<T>();
        public ISet<(int, int)> Edges { get; internal set; } = new HashSet<(int, int)>();

        public void AddEdge(int a, int b)
        {
            Edges.Add(a < b ? (a, b) : (b, a));
        }

        public IEnumerable<(int, int)> EdgesOf(int a)
        {
            return Edges.Where(x => x.Item1 == a || x.Item2 == a);
        }
    }
}