09. Ski Trip

import java.util.Scanner;

public class SkiTrip {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int nights = Integer.parseInt(scanner.nextLine()) - 1;
        String room = scanner.nextLine();
        String rating = scanner.nextLine();

        int roomPricePerNight = 18,
                apartmentPricePerNight = 25,
                    presidentApartmentPerNight = 35;

        double totalSum = 0;

        if (room.equals("room for one person")) {
            totalSum = roomPricePerNight * nights;
        } else if (room.equals("apartment")) {
            totalSum = apartmentPricePerNight * nights;

            if (nights < 10) {
                totalSum *= 0.70;
            } else if (nights < 15) {
                totalSum *= 0.65;
            } else {
                totalSum *= 0.50;
            }
        } else if (room.equals("president apartment")) {
            totalSum = presidentApartmentPerNight * nights;

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

        if (rating.equals("positive")) {
            totalSum *= 1.25;
        } else if (rating.equals("negative")) {
            totalSum *= 0.90;
        }

        System.out.printf("%.2f\n", totalSum);
    }
}

ИЛИ:

import java.util.Scanner;

public class SkiTrip {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int nights = Integer.parseInt(scanner.nextLine()) - 1;
        String room = scanner.nextLine();
        String rating = scanner.nextLine();

        int roomPricePerNight = 18,
                apartmentPricePerNight = 25,
                presidentApartmentPerNight = 35;

        double totalSum = nights * switch (room) {
            case "room for one person" -> roomPricePerNight;
            case "apartment" -> apartmentPricePerNight * (nights < 10 ? 0.70 : nights < 15 ? 0.65 : 0.50);
            case "president apartment" -> presidentApartmentPerNight * (nights < 10 ? 0.90 : nights < 15 ? 0.85 : 0.80);
            default -> 0;
        };

        totalSum *= rating.equals("positive") ? 1.25 : 0.90;

        System.out.printf("%.2f\n", totalSum);
    }
}