using System;

        using System.Collections.Generic;

​

using System.Linq;          

public class Program

{

​

      public static bool SetsEquals(params int[][] sets)

      {

         if (!(sets?.Length > 0)) throw new ArgumentException("There must be one then one set", nameof(sets));

​

         for (var i = 1; i < sets.Length; i++)

            if (sets[0].Length != sets[i].Length)

               return false;

​

         var len = sets[0].Length;

​

         var hash = new HashSet<int>();

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

            if (!hash.Add(sets[0][i])) 

               return false;

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

            for (var j = 1; j < sets.Length; j++)

               if (hash.Add(sets[j][i])) 

                  return false;

​

         return true;

      }

      public static bool SetsEquals2(params int[][] sets)

      {

         if (!(sets?.Length > 0)) throw new ArgumentException("There must be one then one set", nameof(sets));

​

         return sets

            .SelectMany(x => x)

            .GroupBy(x => x)

            .All(x => x.Count() == sets.Length);

      }

​

      public static bool SetsEquals3(params int[][] sets)

      {

         if (!(sets?.Length > 0)) throw new ArgumentException("There must be one then one set", nameof(sets));

​

         var orderedSets = sets

            .Select(x => x.OrderBy(y => y))

            .ToArray();

​

         return orderedSets

            .Skip(1)

            .All(x => x.SequenceEqual(orderedSets[0]));

      }

​

      public static void Main(string[] args)

      {

         var list1 = new []{1, 2, 3, 4, 5};

         var list2 = new[] { 1, 2, 3, 4, 5};

         var list3 = new[] { 2, 3, 4, 5, 1 };

​

         Console.WriteLine(SetsEquals(list1, list2, list3));

         Console.WriteLine(SetsEquals2(list1, list2, list3));

         Console.WriteLine(SetsEquals3(list1, list2, list3));

      }

}