Santas Holiday

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int days = Integer.parseInt(scanner.nextLine()),
                nights = days - 1;
        String type = scanner.nextLine(),
                rating = scanner.nextLine();
        double price = 0;

        if (nights > 0) {
            if (type.equals("room for one person")) {
                price = 18.00;
            } else if (type.equals("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.equals("positive")) {
                price *= 1.25;
            } else {
                price *= 0.90;
            }
        }

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

Решение с тернарен оператор:

import java.util.Scanner;

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

        double price =
                nights > 0 ?
                        ((type.equals("room for one person") ? 18.00
                        : type.equals("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.equals("positive") ? 1.25 : 0.90))
                : 0;

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