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I have to write programm to sort numbers from in ascending order, using vector (C++ language)

I did this using array, and it works perfect. Please could you help me replace array to vector. It's very urgent. :'( My code is:

```
#include <iostream>
void fill_array(int a[], int size, int& number_used);
void sort(int a[], int number_used);
void swap_values(int& v1, int& v2);
int index_of_smallest(const int a[], int start_index, int number_used);
int main( )
{
using namespace std;
cout << "This program sorts numbers from lowest to highest.\n";
int sample_array[10], number_used;
fill_array(sample_array, 10, number_used);
sort(sample_array, number_used);
cout << "In sorted order the numbers are:\n";
for (int index = 0; index < number_used; index++)
cout << sample_array[index] << " ";
cout << endl;
return 0;
}
void fill_array(int a[], int size, int& number_used)
{
using namespace std;
cout << "Enter up to " << size << " nonnegative whole numbers.\n"
<< "Mark the end of the list with a negative number.\n";
int next, index = 0;
cin >> next;
while ((next >= 0) && (index < size))
{
a[index] = next;
index++;
cin >> next;
}
number_used = index;
}
void sort(int a[], int number_used)
{
int index_of_next_smallest;
for (int index = 0; index < number_used - 1; index++)
{
index_of_next_smallest =
index_of_smallest(a, index, number_used);
swap_values(a[index], a[index_of_next_smallest]);
}
}
void swap_values(int& v1, int& v2)
{
int temp;
temp = v1;
v1 = v2;
v2 = temp;
}
int index_of_smallest(const int a[], int start_index, int number_used)
{
int min = a[start_index],
index_of_min = start_index;
for (int index = start_index + 1; index < number_used; index++)
if (a[index] < min)
{
min = a[index];
index_of_min = index;
}
return index_of_min;
}
```