Plata unei sume cu un nr minim de bacnote

#include <iostream>
using namespace std;
#define NMAX 10
struct Banc {
    int val, nr;
} v[NMAX];
int n, s, total;

void read() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> v[i].val >> v[i].nr;
        total += v[i].val * v[i].nr;
    }
    cin >> s;

}

void bsort() {
    bool sorted = false;
    while (!sorted) {
        sorted = true;
        for (int i = 1; i < n; i++)
            if (v[i].val < v[i + 1].val) {
                sorted = false;
                swap(v[i], v[i + 1]);
            }
    }
}

void greedy() {
    int i = 1, nr;
    while (s > 0 && i <= n) {
        nr = 0;
        while (s - v[i].val >= 0 && nr <= v[i].nr) {
            s -= v[i].val;
            nr++;
        }
        cout << v[i].val << '*' << nr << endl;
        i++;
    }
}

int main() {
    read();
    if (total < s)
        return cout << "Imposibil!", 0;
    bsort();
    greedy();
    return 0;
}