#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <deque>
#include <algorithm>
using namespace std;

#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define ALL(c) (c).begin(), (c).end()

typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VI> VVI;
typedef vector<VL> VVL;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

int main() {
    int n, m;
    cin >> n >> m;
    VI a(n);
    REP(i,n) cin >> a[i];
    vector<P> e(m);
    REP(i,m){
        cin >> e[i].first >> e[i].second;
        if (e[i].first > e[i].second) swap(e[i].first, e[i].second);
        e[i].first--;
        e[i].second--;
    }
    sort(ALL(e));

    REP(j,m) REP(i,j){
        if (e[i].second == e[j].first){
            int p = e[i].first;
            int q = e[j].second;
            int r = e[i].second;
            if (a[p] != a[q] && (a[r] > max(a[p], a[q]) || a[r] < min(a[p], a[q]))){
                cout << "YES" << endl;
                return 0;
            }
        }
        if (e[i].second == e[j].second){
            int p = e[i].first;
            int q = e[j].first;
            int r = e[i].second;
            if (a[p] != a[q] && (a[r] > max(a[p], a[q]) || a[r] < min(a[p], a[q]))){
                cout << "YES" << endl;
                return 0;
            }            
        }
        if (e[i].first == e[j].first){
            int p = e[i].second;
            int q = e[j].second;
            int r = e[i].first;
            if (a[p] != a[q] && (a[r] > max(a[p], a[q]) || a[r] < min(a[p], a[q]))){
                cout << "YES" << endl;
                return 0;
            }            
        }
    }
    cout << "NO" << endl;
    return 0;
}