N, M = map(int, input().split())
A = list(map(int, input().split()))
G = [[] for _ in range(N)]
for _ in range(M):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    G[u].append(v)
    G[v].append(u)

for u in range(N):
    if (len(G[u]) < 2):
        continue
    less = set()
    more = set()
    for v in G[u]:
        if A[v] < A[u]:
            less.add(A[v])
        if A[v] > A[u]:
            more.add(A[v])
    if len(less) >= 2 or len(more) >= 2:
        print("YES")
        break
else:
    print("NO")