def kadomatu(x, y, z):
	if x != y and y != z and z != x:
		if (y < x and y < z) or (y > x and y > z):
			return True

def check():
	N, M = map(int, input().split())
	a = list(map(int, input().split()))
	u = [0] * M
	v = [0] * M

	for i in range(M):
		u[i], v[i] = map(int, input().split())

	for i in range(M):
		for j in range(i + 1, M):
			if u[j] == v[i]:
				if kadomatu(a[u[i]-1], a[v[i]-1], a[v[j]-1]):
					return True
			if v[j] == v[i]:
				if kadomatu(a[u[i]-1], a[v[i]-1], a[u[j]-1]):
					return True

	return False

if check():
	print("YES")
else:
	print("NO")