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In C++, the user's input can be used to fill a set as follows:

#include <iostream>
#include <set>
using namespace std;

int main() {
    int n;
    cout << "Enter the number of elements: ";
    cin >> n;

    set<int> mySet;
    cout << "Enter " << n << " integers: ";

    int x;
    for (int i = 0; i < n; i++) {
        cin >> x;
        mySet.insert(x);
    }

    cout << "The elements in the set are: ";
    for (auto it = mySet.begin(); it != mySet.end(); it++)
        cout << *it << " ";

    return 0;
}

In this code, the program prompts the user to enter the number of elements they want to enter into the set. The user's input is stored in the variable n. Then, a set mySet is created.

Next, the program prompts the user to enter n integers. The program then loops through n times, asking the user to input each integer and inserts it into the set using mySet.insert(x).

Finally, the elements in the set are printed out using a for loop that iterates through the set mySet and prints out each element using cout.

Note that this code assumes that the user will only input integers. If the user inputs non-integer values, the program may behave unexpectedly or crash. To handle non-integer inputs, you can add error handling or use a different data type for the set.