Gymnastics

#include <iostream>
#include <iomanip>

using namespace std;

int main() {
    string country, device;
    cin >> country >> device;

    double difficulty = 0, performance = 0;

    if (country == "Russia") {
        if (device == "ribbon") {
            difficulty = 9.100;
            performance = 9.400;
        }
        else if (device == "hoop") {
            difficulty = 9.300;
            performance = 9.800;
        }
        else if (device == "rope") {
            difficulty = 9.600;
            performance = 9.000;
        }
    }
    else if (country == "Bulgaria") {
        if (device == "ribbon") {
            difficulty = 9.600;
            performance = 9.400;
        }
        else if (device == "hoop") {
            difficulty = 9.550;
            performance = 9.750;
        }
        else if (device == "rope") {
            difficulty = 9.500;
            performance = 9.400;
        }
    }
    else if (country == "Italy") {
        if (device == "ribbon") {
            difficulty = 9.200;
            performance = 9.500;
        }
        else if (device == "hoop") {
            difficulty = 9.450;
            performance = 9.350;
        }
        else if (device == "rope") {
            difficulty = 9.700;
            performance = 9.150;
        }
    }

    double score = difficulty + performance;

    cout << fixed << setprecision(3)
        << "The team of " << country << " get " << score << " on " << device << ".\n"
        << setprecision(2) << (20 - score) * 5 << "%\n";

    return 0;
}

РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР И printf():

#include <iostream>
#include <string>

using namespace std;

int main() {
    string country, device;
    cin >> country >> device;

    double score =
        country == "Russia" ?
        (device == "ribbon" ? 9.100 + 9.400 : device == "hoop" ? 9.300 + 9.800 : 9.600 + 9.000) :
        country == "Bulgaria" ?
        (device == "ribbon" ? 9.600 + 9.400 : device == "hoop" ? 9.550 + 9.750 : 9.500 + 9.400) :
        (device == "ribbon" ? 9.200 + 9.500 : device == "hoop" ? 9.450 + 9.350 : 9.700 + 9.150);

    printf("The team of %s get %.3f on %s.\n%.2f%%", country.c_str(), score, device.c_str(), (20 - score) * 5);

    return 0;
}