using System.Collections.Generic

public class Program

{

    private static List<RoadSegment> allSegments;

​

    public static void Main()

    {

        // Test 0

        Node node1 = new()

        {

            AbsolutePosition = new double[2] { 0, 0 },

            Id = 1,

            NodesConnected = new() {2}

        };

​

        Node node2 = new()

        {

            AbsolutePosition = new double[2] { 10, 0 },

            Id = 2,

            NodesConnected = new() { 1 }

        };

​

        allSegments = new()

        {

            new()

            {

                Length = 10,

                MaxSpeed = 30,

                Nodes = new() { node1, node2 }

            }

        };

​

        var found = FindNodeSegments(node1);

​

        Console.WriteLine(found.Count);

    }

​

    private static List<RoadSegment> FindNodeSegments(Node currentNode)

    {

        List<RoadSegment> currentSegments =  allSegments.FindAll(segment => segment.Nodes.Contains(currentNode));

​

        return currentSegments;

    }

}

​

public class RoadSegment

{

    public double Length { get; set; }

​

    public double MaxSpeed { get; set; }

​

    public List<Node> Nodes { get; set; }

}

​

public class Node

{

    public int Id { get; set; }

    public double[] AbsolutePosition { get; set; }

    public List<int> NodesConnected { get; set; }

}