import sys,collections
from operator import itemgetter
sys.setrecursionlimit(10**7)
def Is(): return [int(x) for x in sys.stdin.readline().split()]
def Ss(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def S(): return input()

n,m = Is()
As = [0] + Is()
g = [[] for i in range(n+1)]
for i in range(m):
    u,v = Is()
    g[u].append(v)
    g[v].append(u)
for i,a in enumerate(As):
    if i == 0 or i == n:
        continue
    if len(g[i]) >= 2:
        big,small = [],[]
        for e in g[i]:
            if As[e] > a:
                big.append(As[e])
            if As[e] < a:
                small.append(As[e])
        if len(set(big)) >= 2 or len(set(small)) >= 2:
            print("YES")
            exit()
print("NO")