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

namespace Contest
{
    class Scanner
    {
        private string[] line = new string[0];
        private int index = 0;
        public string Next()
        {
            if (line.Length <= index)
            {
                line = Console.ReadLine().Split(' ');
                index = 0;
            }
            var res = line[index];
            index++;
            return res;
        }
        public int NextInt()
        {
            return int.Parse(Next());
        }
        public long NextLong()
        {
            return long.Parse(Next());
        }
        public string[] Array()
        {
            line = Console.ReadLine().Split(' ');
            index = line.Length;
            return line;
        }
        public int[] IntArray()
        {
            return Array().Select(int.Parse).ToArray();
        }
        public long[] LongArray()
        {
            return Array().Select(long.Parse).ToArray();
        }
    }

    class Program
    {
        private int N, M;
        private int[] A;
        private List<int>[] R;
        public void Solve()
        {
            var sc = new Scanner();
            N = sc.NextInt();
            M = sc.NextInt();
            A = sc.IntArray();
            R = new List<int>[N];
            for (int i = 0; i < M; i++)
            {
                var u = sc.NextInt() - 1;
                var v = sc.NextInt() - 1;
                R[u].Add(v);
                R[v].Add(u);
            }

            for (int i = 0; i < N; i++)
            {
                bool less = false;
                bool great = false;
                foreach (int j in R[i])
                {
                    if (A[j] < A[i])
                    {
                        less = true;
                    }
                    if (A[j] > A[i])
                    {
                        great = true;
                    }
                }
                if(less&&great)
                {
                    Console.WriteLine("YES");
                    return;
                }
            }
            Console.WriteLine("NO");
        }

        static void Main(string[] args)
        {
            new Program().Solve();
        }
    }
}