from collections import defaultdict


def main():
    n, m = map(int, input().split())
    a = [0] + list(map(int, input().split()))

    adj = defaultdict(set)
    for _ in range(m):
        fr, to = map(int, input().split())
        if a[fr] != a[to]:
            adj[fr].add(to)
            adj[to].add(fr)

    for i in range(n + 1):
        if len(adj[i]) < 2:
            continue
        big = len(set([a[x] for x in adj[i] if a[x] > a[i]]))
        small = len(set([a[x] for x in adj[i] if a[x] < a[i]]))
        if big > 1 or small > 1:
            exit(print("YES"))
    print("NO")


if __name__ == "__main__":
    main()