#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> a(n);
    for(int i=0; i<n; ++i)
        cin >> a[i];

    vector<vector<int> > edges(n);
    for(int i=0; i<m; ++i){
        int u, v;
        cin >> u >> v;
        edges[u-1].push_back(v-1);
        edges[v-1].push_back(u-1);
    }

    bool ans = false;
    for(int i=0; i<n; ++i){
        vector<set<int> > s(2);
        for(int j : edges[i]){
            if(a[j] < a[i])
                s[0].insert(a[j]);
            else if(a[j] > a[i])
                s[1].insert(a[j]);
        }
        if(s[0].size() > 1 || s[1].size() > 1){
            cout << "YES" << endl;
            return 0;
        }
    }

    cout << "NO" << endl;
    return 0;
}