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

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int N, M;
    cin >> N >> M;
    vector<int> a;
    bool b = false;
    for (int i = 0; i < N; ++i) {
        int t;
        cin >> t;
        a.emplace_back(t);
    }
    
    vector< unordered_set<int> > v(N, unordered_set<int>());
    for (int i = 0; i < M; ++i) {
        int u1, u2;
        cin >> u1 >> u2;
        v[u1-1].emplace(a[u2-1]);
        v[u2-1].emplace(a[u1-1]);
    }
    
    for (int i = 0; i < v.size(); ++i) {
        if (v[i].size() < 2) { continue; }
        int cnt;
        cnt = 0;
        for (auto &j : v[i]) {
            if (a[i] < j) { cnt += 1; }
        }
        if (cnt > 1) {
            b = true;
            break;
        }
        
        cnt = 0;
        for (auto &j : v[i]) {
            if (a[i] > j) { cnt += 1; }
        }
        if (cnt > 1) {
            b = true;
            break;
        }
    }
    cout << (b ? "YES" : "NO") << endl;
    return 0;
}