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


int main() {

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int N,M;
    cin>>N>>M;
    vector<int> A(N);
    for(int i=0;i<N;i++)cin>>A[i];
    vector<vector<int>> G(N);
    for(int i=0;i<M;i++){
        int u,v;
        cin>>u>>v;
        u--;v--;
        G[u].push_back(A[v]);
        G[v].push_back(A[u]);
    }
    for(int i=0;i<N;i++){
        if(G[i].size()<2)continue;
        sort(G[i].begin(),G[i].end());
        auto p=upper_bound(G[i].begin(),G[i].end(),A[i]);
        if(p!=G[i].end()){
            if((*p)!=G[i].back()){
                cout<<"YES"<<endl;
                return 0;
            }
        }
        p=upper_bound(G[i].begin(),G[i].end(),G[i][0]);
        if(p!=G[i].end()&&(*p)<A[i]){
            cout<<"YES"<<endl;
                return 0;
        }
    }
    cout<<"NO"<<endl;

}