#line 2 "/home/sakflat/CP/_library/cpp/template/template.cpp"

//yukicoder@cpp17

#include <iostream>
#include <iomanip>

#include <algorithm>

#include <cmath>
#include <cctype>
#include <climits>
#include <cassert>

#include <string>
#include <vector>
#include <set>
#include <stack>
#include <queue>
#include <map>

#include <random>

#include <bitset>

#include <complex>

#include <utility>

#include <numeric>

#include <functional>


using namespace std;
using ll = long long;
using P = pair<ll,ll>;


const ll MOD = 998244353;
const ll MODx = 1000000007;
const int INF = (1<<30)-1;
const ll LINF = (1LL<<62LL)-1;
const double EPS = (1e-10);


P ar4[4] = {{0,1},{0,-1},{1,0},{-1,0}};
P ar8[8] = {{-1,-1},{-1,0},{-1,1},{0,-1},{0,1},{1,-1},{1,0},{1,1}};


template <typename T> vector<T> make_vector(size_t a, T b) { return vector<T>(a, b); }
template <typename... Ts> auto make_vector(size_t a, Ts... ts) { return vector<decltype(make_vector(ts...))>(a, make_vector(ts...)); }
 
/*
確認ポイント
cout << fixed << setprecision(n) << 小数計算//n桁の小数表記になる

計算量は変わらないが楽できるシリーズ
min(max)_element(iter,iter)で一番小さい(大きい)値のポインタが帰ってくる
count(iter,iter,int)でintがiterからiterの間にいくつあったかを取得できる
*/

/* comment outed because can cause bugs
__attribute__((constructor))
void initial() {
  cin.tie(0);
  ios::sync_with_stdio(false);
}
*/
#line 2 "/home/sakflat/CP/_library/cpp/template/basic.cpp"

int main(){
  int n,m;cin>>n>>m;
  vector<int> A(n);
  for(int i = 0; n > i; i++)cin>>A[i];
  vector<vector<int>> B(n, vector<int>());
  for(int i = 0; m > i; i++){
    int x,y;cin>>x>>y;x--;y--;
    B[x].push_back(y);
    B[y].push_back(x);
  }
  for(int i = 0; n > i; i++){
    if(B[i].size() <= 1)continue;
    int dec = -1;
    int gre = -1;
    for(int j = 0; m > j; j++){
      if(A[B[i][j]] < A[i]){
        if(dec == -1){
          dec = A[B[i][j]];
        }else if(dec != A[B[i][j]]){
          cout << "YES" << endl;
          return 0;
        }
      }else if(A[B[i][j]] > A[i]){
        if(gre == -1){
          gre = A[B[i][j]];
        }else if(gre != A[B[i][j]]){
          cout << "YES" << endl;
          return 0;
        }
      }
    }
  }
  cout << "NO" << endl;
  return 0;
}