import sys
readline = sys.stdin.readline

N,M = map(int,readline().split())
A = list(map(int,readline().split()))
G = [[] for i in range(N)]
for _ in range(M):
    u,v = map(int,readline().split())
    G[u - 1].append(v - 1)
    G[v - 1].append(u - 1)
    
for v in range(N):
    if len(G[v]) < 2:
        continue
    less = set()
    more = set()
    for child in G[v]:
        if A[child] < A[v]:
            less.add(A[child])
        if A[child] > A[v]:
            more.add(A[child])
    if len(less) >= 2 or len(more) >= 2:
        print("YES")
        break
else:
    print("NO")