using System;

using System.Collections.Generic;

using System.Linq;

namespace Interview

{

    public static class Utility

    {

        public static bool ContainsDuplicates(IEnumerable<int> data)

        {

            // TODO: Given a collection of integers, return:

            //   True if any integer is in the collection more than once

            //   False if all integers are unique.

             if (data.Count() != data.Distinct().Count())

                return true;

            else                            

                return false;

        }

    }

    public static class Program

    {

        public static void Main()

        {

            // TODO: Implement a few tests of the function ContainsDuplicates here.

             List<int> dups = new List<int>();

                dups.Add(1);

                dups.Add(2);

                dups.Add(2);

                dups.Add(3);

            var hasDuplicates = Utility.ContainsDuplicates(dups);

            Console.WriteLine(hasDuplicates);

        }       

    }

}