N,M = map(int,input().split())

a = list(map(int,input().split()))

b = [[[],[]] for i in range(N)]
flag=False
for i in range(M):
    u,v = map(int,input().split())
    if a[u-1]<a[v-1]:
        if not v-1 in b[u-1][1]:
            b[u-1][1].append(v-1)
            b[v-1][0].append(u-1)
            if len(b[u-1][1])>=2 or len(b[v-1][0])>=2:
                flag=True
                
    elif a[u-1]>a[v-1]:
        if not u-1 in b[v-1][1]:
            b[v-1][1].append(u-1)
            b[u-1][0].append(v-1)
            if len(b[u-1][0])>=2 or len(b[v-1][1])>=2:
                flag=True
                
            
if flag:
    print("YES")
else:
    print("NO")