#include <iostream>
#include <vector>
using namespace std;
struct NODE{
	int id;
	vector<NODE> link;
	NODE(){
		id=0;
		link.clear();
	}
	void AddLine(NODE _link){
		link.push_back(_link);
	}
	bool Check(){
		if (link.size()<=1){
			return false;
		}
		int i,j;
		for (i=0;i<link.size()-1;i++){
			for (j=i+1;j<link.size();j++){
				int id1=link[i].id;
				int id2=link[j].id;
				if (id1!=id2 && (id1<id && id2<id || id1>id &&id2>id)){
					return true;
				}
			}
		}
		return false;
	}
};
int main(int argc, char* argv[])
{
	int N,M;
	cin>>N>>M;
	vector<NODE> a(N+1);
	int i;
	int ID;
	for (i=1;i<=N;i++){
		cin>>ID;
		a[i].id=ID;
	}
	int u,v;
	for (i=1;i<=M;i++){
		cin>>u>>v;
		a[u].AddLine(a[v]);
		a[v].AddLine(a[u]);
		if (a[u].Check()){
			cout<<"YES"<<endl;
			return 0;
		}
		if (a[v].Check()){
			cout<<"YES"<<endl;
			return 0;
		}
	}
	cout<<"NO"<<endl;
	return 0;
}