#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define REP(i, a, b) for(int i = a; i < b; i++)
#define RREP(i, a, b) for(int i = a; i > b; i--)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
typedef long long ll;

int main() {
    fastcin;
    int N, M;
    cin >> N >> M;
    vector<ll> a(N+1);
    REP(i, 1, N+1) cin >> a[i];
    int e[1001][1001] = {};
    REP(i, 0, M) {
        int u, v;
        cin >> u >> v;
        e[u][v] = 1;
        e[v][u] = 1;
    }
    REP(i, 1, N+1) {
        REP(j, 1, N+1) {
            if(e[i][j]) {
                ll c = a[i], s1 = a[j];
                if(c!=s1) {
                    REP(k, 1, N+1) {
                        if(e[j][k]) {
                            ll s2 = a[k];
                            if((s1 < c && c > s2 && s1 != s2)
                                ||(s1 > c && c < s2 && s1 != s2)) {
                                    cout << "YES" << endl;
                                    return 0;
                            }
                        }
                    }
                }
            }
        }
    }
    cout << "NO" << endl;
    return 0;
}