import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int[] arr = new int[n + 1];
		TreeSet<Integer>[] graph = new TreeSet[n + 1];
		for (int i = 1; i <= n; i++) {
		    arr[i] = sc.nextInt();
		    graph[i] = new TreeSet<Integer>();
		}
		for (int i = 0; i < m; i++) {
		    int a = sc.nextInt();
		    int b = sc.nextInt();
		    graph[a].add(arr[b]);
		    graph[b].add(arr[a]);
		}
		for (int i = 1; i <= n; i++) {
		    Integer small = graph[i].lower(arr[i]);
		    if (small != null) {
		        if (graph[i].lower(small) != null) {
		            System.out.println("YES");
		            return;
		        }
		    }
		    Integer large = graph[i].higher(arr[i]);
		    if (large != null) {
		        if (graph[i].higher(large) != null) {
		            System.out.println("YES");
		            return;
		        }
		    }
		}
		System.out.println("NO");
	}
}