import sys
from itertools import permutations

def main():
    n, m = map(int, sys.stdin.readline().split())
    a = list(map(int, sys.stdin.readline().split()))
    adj = [[] for _ in range(n + 1)]  # Using 1-based index for vertices

    for _ in range(m):
        u, v = map(int, sys.stdin.readline().split())
        adj[u].append(v)
        adj[v].append(u)

    for b in range(1, n + 1):
        neighbors = adj[b]
        if len(neighbors) < 2:
            continue
        for a_node, c_node in permutations(neighbors, 2):
            x1 = a[a_node - 1]
            x2 = a[b - 1]
            x3 = a[c_node - 1]
            if x1 == x2 or x2 == x3 or x1 == x3:
                continue
            if (x2 > x1 and x2 > x3) or (x2 < x1 and x2 < x3):
                print("YES")
                return

    print("NO")

if __name__ == "__main__":
    main()