UVA - 10114 .cpp file

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int duration;
    double down_payment, loan;
    int deprecation_num;
    double deprecation[101];
    int m;
    double d;

    while (cin >> duration >> down_payment >> loan >> deprecation_num)
    {
        if (duration < 0)
            break;

        while (deprecation_num--)
        {
            cin >> m >> d;
            for (int i = m; i < 101; i++)
                deprecation[i] = d;
        }

        int months = 0;
        double loan_diff = loan / duration;
        double car_value = (down_payment + loan) * (1 - deprecation[0]);
        while (car_value < loan)
        {
            months++;
            loan -= loan_diff;
            cvalue = cvalue * (1 - dep[months]);
        }

        if (months == 1)
        {
            cout << "1 month" << endl;
        }
        else
        {
            cout << months << " months" << endl;
        }
    }

    return 0;
}