Santas Holiday

#include <iostream>
#include <string>

using namespace std;

int main() {
    int days;
    cin >> days;

    int nights = days - 1;

    string type, rating;
    cin >> type >> rating;

    double price = 0;

    if (nights > 0) {
        if (type == "room for one person") {
            price = 18.00;
        }
        else if (type == "apartment") {
            price = 25.00;

            if (nights < 10) {
                price *= 0.70;
            }
            else if (nights > 15) {
                price *= 0.50;
            }
            else {
                price *= 0.65;
            }
        }
        else {
            price = 35.00;

            if (nights < 10) {
                price *= 0.90;
            }
            else if (nights > 15) {
                price *= 0.80;
            }
            else {
                price *= 0.85;
            }
        }

        if (rating == "positive") {
            price *= 1.25;
        }
        else {
            price *= 0.90;
        }
    }

    printf("%.2f\n", price * nights);

    return 0;
}

Решение с тернарен оператор:

#include <iostream>
#include <string>

using namespace std;

int main() {
    int days;
    cin >> days;

    int nights = days - 1;

    string type, rating;
    cin >> type >> rating;

    double price =
        nights > 0 ?
        ((type == "room for one person" ? 18.00 :
            type == "apartment" ? 25.00 * (nights < 10 ? 0.70 : nights > 15 ? 0.50 : 0.65) :
            35.00 * (nights < 10 ? 0.90 : nights > 15 ? 0.80 : 0.85)) * (rating == "positive" ? 1.25 : 0.90)) : 0;

    printf("%.2f\n", price * nights);

    return 0;
}