Binary search. H

#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  cin >> n >> k;
  vector<int> v(n);
  for(int i=0; i<n; ++i) cin >> v[i];
  for(int i=0; i<k; ++i)
  {
    int x;
    cin >> x;
    cout << ( binary_search(v.begin(), v.end(), x) ? "YES" : "NO" ) << endl;
  }
}