Submission #3547231

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Source Code Expand

#include <iostream>
using namespace std;

int main(){
  int n, a, b, k, p;
  cin >> n >> a >> b >> k;
  int count[100] = {0};
  count[a-1]++; count[b-1]++;
  for(int i = 0; i < k; i++){
    cin >> p;
    count[p-1]++;
  }
  for(int i = 0; i < n; i++){
    if(count[i] > 1){
      cout << "NO" << endl;
      return 0;
    }
  }
  cout << "YES" << endl;
  return 0;
}

Submission Info

Judge Result