#include <bits/stdc++.h>
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>> E(N);
  for (int i = 0; i < M; i++){
    int u, v;
    cin >> u >> v;
    u--;
    v--;
    E[u].push_back(v);
    E[v].push_back(u);
  }
  vector<set<int>> st1(N), st2(N);
  for (int i = 0; i < N; i++){
    for (int j : E[i]){
      if (a[j] < a[i]){
        st1[i].insert(a[j]);
      }
      if (a[j] > a[i]){
        st2[i].insert(a[j]);
      }
    }
  }
  for (int i = 0; i < N; i++){
    if (st1[i].size() >= 2 || st2[i].size() >= 2){
      cout << "YES" << endl;
      return 0;
    }
  }
  cout << "NO" << endl;
}