import java.io.*;
import java.util.*;


public class Main_yukicoder629 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int n = sc.nextInt();
		int m = sc.nextInt();

		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = sc.nextInt();
		}

		List<List<Integer>> edges = new ArrayList<>(n);
		for (int i = 0; i < n; i++) {
			edges.add(new ArrayList<>());
		}
		for (int i = 0; i < m; i++) {
			int u = sc.nextInt() - 1;
			int v = sc.nextInt() - 1;

			edges.get(u).add(v);
			edges.get(v).add(u);
		}

		for (int i = 0; i < n; i++) {
			int x2 = a[i];

			if (edges.get(i).size() >= 2) {
				for (int e1 : edges.get(i)) {
					int x1 = a[e1];
					for (int e2 : edges.get(i)) {
						int x3 = a[e2];

						if ((x2 > x1 && x2 > x3 && x1 != x3) || (x2 < x1 && x2 < x3 && x1 != x3)) {
							pr.println("YES");
							return;
						}
					}
				}
			}
		}

		pr.println("NO");
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}