2010 - Episode IV Problem A

#include <fstream>
#include <algorithm>
#include <string>

using namespace std;

int main()
{
    string str;
    int discount = 5;

    ifstream ifs("discount.in");
    getline(ifs, str);
    ifs.close();

    sort(str.begin(), str.end());

    str[0] += 32;
    for (int i = 1; i < str.size(); i++)
    {
        if (str[i] != str[i - 1])
        {
            discount += 5;
        }
    }

    ofstream ofs("discount.out");
    ofs << discount << '%' << endl << str << endl;
    ofs.close();
}