using System;

using System.Collections.Generic;   

​

​

​

public class Program

{

    class Node

    {

        int wartosc;

        public Node(int wartosc)

        {

            this.wartosc=wartosc;

        }

        public override string ToString()

        {

            return this.wartosc.ToString();

        }

    }

    class Krawedz

    {

        public Node start;

        public Node koniec;

        public int waga;

        public Krawedz(Node s,Node k,int w=1)

        {

           this.start=s;

           this.koniec=k;

           this.waga=w;

        }

        public override string ToString()

        {

​

            return $"{this.start}-{this.koniec}({this.waga})";

        }

        public Node znajdzDrugi(Node n)

        {

            return this.start==n?this.koniec:this.start;

        }

    }

    class Graf

    { 

        public List<Node>nodes;

        public List<Krawedz>krawedzie;

        public Graf()

        {

​

            this.nodes=new List<Node>();

            this.krawedzie=new List<Krawedz>();

        }

        public List<Krawedz>ZnajdzKrawedzie(Node n)

        {

           List<Krawedz>wynik=new List<Krawedz>();

            for(int i=0;i<this.krawedzie.Count;i++)

            {

               var k =this.krawedzie[i];

                if(k.start==n||k.koniec==n)

                {

​

                    wynik.Add(k);

                }

            }

            return wynik;

        }

    }

    public static void Main()

    {

        List<Node>w=new List<Node>();

        List<Krawedz>k=new List<Krawedz>();

        w.Add(new Node(5));

        w.Add(new Node(2));

        //k.Add()

    }

}