def Is():return map(int,input().split())
N,M = Is()
node = [0] + list(Is())
side = [[]for i in range(N+1)]

for i in range(M):
    a,b = Is()
    side[a].append(b)
    side[b].append(a)

for i in range(1,N+1):
    if len(side[i])<2:
        continue
    big = set()
    sml = set()
    for j in side[i]:
        if node[i]<node[j]:
            big.add(node[j])
        elif node[i]>node[j]:
            sml.add(node[j])
    if len(list(big))>1 or len(list(sml))>1:
        print("YES")
        break
else:
    print("NO")