using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var result= CompareTriplets(new List<int>{2,1,3,4},new List<int>{3,1,2,7} );

        if (result==null)

            Console.WriteLine("Error");

​

        foreach(var item in result)

        {

            Console.WriteLine(item);

​

        }

    }

    public static List<int> CompareTriplets(List<int> a, List<int> b) {

​

        if(a.Count!=b.Count)

        {return null;}

        var bob=0;

        var alice=0;

        var ab= a.Zip(b, (aa,bb) => new { ANumber = aa, BNumber = bb });

        foreach (var aAndb in ab)

        {

            if(!(aAndb.ANumber<1 || aAndb.ANumber>100 )||(aAndb.BNumber<1 ||aAndb.BNumber>100))

            {

                    if(aAndb.ANumber!=aAndb.BNumber)

                    {

                        if(aAndb.ANumber>aAndb.BNumber)

                        alice+=1;

                        else{

                            bob+=1;}

                    }

            }

            return null;

        }

        var result=new List<int>(){alice,bob }; 

        return result;

    }

}

​