N,M = map(int,input().split())
lsa = list(map(int,input().split()))
lsg = [[] for i in range(N)]
for i in range(M):
    a,b = map(int,input().split())
    a -= 1
    b -= 1
    lsg[a].append(b)
    lsg[b].append(a)

for st in range(N):
    sta = lsa[st]
    for n1 in lsg[st]:
        for n2 in lsg[n1]:
            if sta < lsa[n1] and lsa[n1] > lsa[n2] and sta != lsa[n2]:
                print('YES')
                exit()
            if sta > lsa[n1] and lsa[n1] < lsa[n2] and sta != lsa[n2]:
                print('YES')
                exit()
print('NO')