#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    ll n, m;
    cin >> n >> m;
    vector<ll> a(n);
    rep(i, n) cin >> a[i];
    vector<set<ll>> g(n);
    rep(i, m) {
        ll u, v;
        cin >> u >> v;
        u--; v--;
        g[u].insert(a[v]);
        g[v].insert(a[u]);
    }
    rep(i, n) {
        vector<ll> vs;
        for(auto x : g[i]) vs.push_back(x);
        auto it = lower_bound(all(vs), a[i]);
        ll left = it - vs.begin();
        if (left >= 2) {
            cout << "YES" << endl;
            return 0;
        }
        ll right = sz(vs) - left;
        if (right >= 2) {
            cout << "YES" << endl;
            return 0;
        }
    }
    cout << "NO" << endl;
    return 0;
}