n, m = [int(x) for x in input().split()]
score = [int(x) for x in input().split()]
g = [[] for i in range(n)]
for i in range(m):
    u, v = [int(x) for x in input().split()]
    g[u - 1].append(v - 1)
    g[v - 1].append(u - 1)

for i, v in enumerate(g):
    tmp = [score[j] for j in v if score[i] < score[j]]
    if len(tmp) >=2:
        if len(set(tmp)) >=2:
            print("YES")
            exit()

    tmp = [score[j] for j in v if score[i] > score[j]]
    if len(tmp) >=2:
        if len(set(tmp)) >=2:
            print("YES")
            exit()

print("NO")