Problem:
Score : 300 points

Problem Statement

Given is a sequence of integers A_1, A_2, ..., A_N.
If its elements are pairwise distinct, print YES; otherwise, print NO.

Constraints

2 ≤ N ≤ 200000

1 ≤ A_i ≤ 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 ... A_N

Output

If the elements of the sequence are pairwise distinct, print YES; otherwise, print NO.

Sample Input 1

5
2 6 1 4 5

Sample Output 1

YES

The elements are pairwise distinct.

Sample Input 2

6
4 1 3 1 6 2

Sample Output 2

NO

The second and fourth elements are identical.

Sample Input 3

2
10000000 10000000

Sample Output 3

NO

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace C___Distinct_or_Not
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] a = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);

            Array.Sort(a);

            for (int i = 0; i < n - 1; i++)
            {
                if (a[i] == a[i + 1])
                {
                    Console.WriteLine("NO");
                    Environment.Exit(0);
                }
            }

            Console.WriteLine("YES");

            //System.Collections.ArrayList al = new System.Collections.ArrayList(a.Length);

            //foreach (int i in a)
            //{
            //    if (!al.Contains(i))
            //    {
            //        al.Add(i);
            //    }
            //}

            //if (a.Length == al.Count)
            //{
            //    Console.WriteLine("YES");
            //}
            //else
            //{
            //    Console.WriteLine("NO");
            //}


            //for(int i = 0; i < n; i++)
            //{
            //    for(int j = i + 1; j < n; j++)
            //    {
            //        if(a[i] - a[j] == 0)
            //        {
            //            Console.WriteLine("NO");
            //            Console.ReadKey();
            //            Environment.Exit(0);
            //        }
            //    }
            //}

            //Console.WriteLine("YES");
            //Console.ReadKey();

        }
    }
}