#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("YES")
#define p_no() p("NO")

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

    // input
    ll N, M;
    cin >> N >> M;

    vector<ll> A(N);
    FOR(i, 0, N){
        cin >> A.at(i);
    }

    vector<ll> G[N];
    FOR(i, 0, M){
        ll u, v; cin >> u >> v;
        u--;
        v--;
        G[u].push_back(v);
        G[v].push_back(u);
    }

    FOR(i, 0, N){
        ll center = A[i];
        set<ll> up;
        set<ll> down;
        for(ll to : G[i]){
            if(A[to]>center){
                up.insert(A[to]);
            }
            else if(A[to]<center){
                down.insert(A[to]);
            }
        }
        if(up.size()>=2 || down.size()>=2){
            p_yes();
            return 0;
        }
    }
    p_no();
    return 0;
}