import sys
input = sys.stdin.readline

N,M=map(int,input().split())
A=list(map(int,input().split()))
E=[[] for i in range(N)]

for i in range(M):
    x,y=map(int,input().split())
    x-=1
    y-=1
    E[x].append(y)
    E[y].append(x)

for i in range(N):
    a=A[i]

    for to in E[i]:
        b=A[to]
        for toto in E[to]:
            c=A[toto]

            if a<b and b>c and a!=c:
                print("YES")
                exit()
            if a>b and b<c and a!=c:
                print("YES")
                exit()

print("NO")