#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using PII = std::pair<int, int>;
using PLL = std::pair<ll, ll>;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)


struct node
{
    int point;
    set<int> lt_point;
    set<int> gt_point;
};

int main()
{

#ifdef DEBUG
    cout << "DEBUG MODE" << endl;
    ifstream in("input.txt"); //for debug
    cin.rdbuf(in.rdbuf());    //for debug
#endif

    int n, m, s, t;
    cin >> n >> m;
    node nodes[n];
    bool ans = false;

    rep(i, n)
        cin >> nodes[i].point;
    rep(i, m)
    {
        cin >> s >> t;
        s--, t--;

        if (nodes[s].point < nodes[t].point)
        {
            nodes[s].gt_point.insert(nodes[t].point);
            nodes[t].lt_point.insert(nodes[s].point);
        }
        else if (nodes[s].point > nodes[t].point)
        {
            nodes[s].lt_point.insert(nodes[t].point);
            nodes[t].gt_point.insert(nodes[s].point);
        }
    }
    rep(i, n)
    {
        if (nodes[i].gt_point.size() >= 2)
            ans = true;
        if (nodes[i].lt_point.size() >= 2)
            ans = true;
    }
    
    cout << ( ans ? "YES" : "NO" ) << endl;
    return 0;
}