Could anyone help me?
This code get CRASH...

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
// Input Database
int num_elem_db;
cin >> num_elem_db;
vector<int> data_vector (num_elem_db, 0); // Vector for data
for (int i = 0; i < num_elem_db; ++i)
{
   int aux_elem;
   cin >> aux_elem;
   data_vector[i] = aux_elem;
}
cout << "###" << endl;
// SORTING VECTOR OF DATA
sort( data_vector.begin( ), data_vector.end( ) );
// Input queries
int num_queries;
cin >> num_queries;
vector<int> query_vector (num_queries, 0); // Vector for queries
for (int j = 0; j < num_queries; ++j)
{
   int aux_query;
   cin >> aux_query;
   query_vector[j] = aux_query;
}
for (int k = 0; k < num_queries; ++k)
{
   cout << data_vector[query_vector[k]-1] << endl;
}
return 0;
}