nr max cu cifrele unui nr

#include <iostream>

using namespace std;

int main() {
    int n, p=0;
    cout << "introdu numarul:" << endl;     cin >> n;
    for (int i = 9; i >= 0; i--)
    {
        int v = n;
        while (v > 0)
        {
            int c = v % 10;
            v /= 10;
            if (i == c)
            {
                p = p * 10 + c;
                break;
            }
        }
    }
    cout <<p<<endl;
    system("pause");
}