using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text;

public class Program
{

    public void Proc()
    {
        int[] inpt = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();

        int pointCount = inpt[0];
        int pathCount = inpt[1];

        int[] pointList = Reader.ReadLine().Split(' ').Select(a => int.Parse(a)).ToArray();

        Dictionary<int, Dictionary<int, bool>> path = new Dictionary<int, Dictionary<int, bool>>();
        for (int i = 0; i < pathCount; i++) {
            inpt = Reader.ReadLine().Split(' ').Select(a => int.Parse(a) - 1).ToArray();
            if(!path.ContainsKey(inpt[0])) {
                path.Add(inpt[0], new Dictionary<int, bool>());
            }
            path[inpt[0]].Add(inpt[1], true);
            if(!path.ContainsKey(inpt[1])) {
                path.Add(inpt[1], new Dictionary<int, bool>());
            }
            path[inpt[1]].Add(inpt[0], true);
        }
        bool hasKadomatu = false;
        for (int i = 0; i < pointCount; i++) {
            int num = pointList[i];
            if(!path.ContainsKey(i)) {
                continue;
            }
            if(path[i].Count(a=>pointList[a.Key]<num)>=2) {
                hasKadomatu = true;
                break;
            } else if(path[i].Count(a=>pointList[a.Key]>num)>=2) {
                hasKadomatu = true;
                break;
            }
        }
        Console.WriteLine(hasKadomatu?"YES":"NO");
    }



    public class Reader
    {
        private static StringReader sr;
        public static bool IsDebug = false;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (sr == null)
                {
                    sr = new StringReader(InputText.Trim());
                }
                return sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        private static string InputText = @"



3 2
1 3 2
1 2
2 3


";
    }

    public static void Main(string[] args)
    {
#if DEBUG
        Reader.IsDebug = true;
#endif
        Program prg = new Program();
        prg.Proc();
    }
}