import sys

sys.setrecursionlimit(10 ** 6)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()
ntp = lambda: tuple(map(int, stdin.readline().split()))
mod = 10 * 9 + 7
inf = 2 << 60

n, m = na()
A = na()
G = [[] for _ in range (n)]


for _ in range(m):
    u, v = na()
    G[u - 1].append(v - 1)
    G[v - 1].append(u - 1)

for i in range(n):
    up = 0
    dn = 0
    num = set()
    for g in G[i]:
        if not(A[g] in num):
            if A[g] < A[i]:
                dn += 1
            if A[g] > A[i]:
                up += 1
            num.add(A[g])
    if up > 1 or dn > 1:
        print('YES')
        exit()

print('NO')