#include <bits/stdc++.h>
//#include <math.h>
using namespace std;

#define INF 1.1e9
#define LINF 1.1e18
#define FOR(i,a,b) for (int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define pb push_back
#define pf push_front
#define fi first
#define se second
#define BIT(x,n) bitset<n>(x)
#define PI 3.14159265358979323846

typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<int,P> PP;

struct edge {
	int to, cost;
	edge(int t,int c):to(t),cost(c) {}
};
int dx[]={1,-1,0,0},dy[]={0,0,1,-1};

//-----------------------------------------------------------------------------

int n,m;
vector<int> g[1000];
int a[1000];

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	cin>>n>>m;
	REP(i,n) cin>>a[i];
	REP(i,m) {
		int x,y;cin>>x>>y;x--,y--;
		g[x].pb(y),g[y].pb(x);
	}
	REP(i,n) {
		for(auto u:g[i]) {
			if(a[i]<a[u]) {
				for(auto v:g[u]) {
					if(v!=i&&a[v]<a[u]&&a[v]!=a[i]) {
						cout<<"YES"<<endl;return 0;
					}
				}
			}
			else if(a[i]>a[u]) {
				for(auto v:g[u]) {
					if(v!=i&&a[v]>a[u]&&a[v]!=a[i]) {
						cout<<"YES"<<endl;
						return 0;
					}
				}
			}
		}
	}
	cout<<"NO"<<endl;

	return 0;
}