using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(CheckSectionsIntersect(new []{"U","L","D","D","R","U"},6));

        Console.WriteLine(CheckSectionsIntersect(new []{"D","L","U","L"},4));

        Console.WriteLine(CheckSectionsIntersect(new []{"D","L","L","R"},4));

    }

    static Dictionary<string,(int X,int Y)> transforms = new Dictionary<string, (int X, int Y)>{

        ["U"] = (0,1),

        ["D"] = (0,-1),

        ["L"] = (-1,0),

        ["R"] = (1,0)

    };

    static bool CheckSectionsIntersect(string[] sectionDirection, int numberOfSections)

    {

        (int X, int Y) pos = (0,0);

        var visited = new List<(int X, int Y)>{ pos };

        for(var i = 0;i<numberOfSections;i++)

        {

            if(!transforms.TryGetValue(sectionDirection[i], out var transform))

               throw new ArgumentException("sectionDirections");

            (int X, int Y) newPos = (pos.X + transform.X, pos.Y + transform.Y);

            if(visited.Contains(newPos))

                return true;    

            pos = newPos;

            visited.Add(newPos);

        }

        return false;

    }

}