from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline
N,M = map(int,input().split())
A = list(map(int,input().split()))
e = [[] for _ in range(N)]
for _ in range(M):
    u,v = map(int,input().split())
    u -= 1
    v -= 1
    e[u].append(v)
    e[v].append(u)
    
    
for i in range(N):
    
    a = A[i]
    X = list(set(A[j] for j in e[i]))
    X.sort()
    if len(X)<=1:
        continue
    if X[-2]>a:
        print('YES')
        exit()
    if X[1]<a:
        print('YES')
        exit()
print('NO')