n, m = map(int, input().split())
A = list(map(int, input().split()))
up = [set() for _ in range(n)]
down = [set() for _ in range(n)]

for _ in range(m):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    if A[u] < A[v]:
        up[u].add(A[v])
        down[v].add(A[u])
    elif A[u] > A[v]:
        up[v].add(A[u])
        down[u].add(A[v])
for i in range(n):
    if len(up[i]) >= 2 or len(down[i]) >= 2:
        print("YES")
        break
else:
    print("NO")