05. Game Of Intervals

import java.util.Scanner;

public class GameOfIntervals {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());
        int num0To10 = 0;
        int num10To20 = 0;
        int num20To30 = 0;
        int num30To40 = 0;
        int num40To50 = 0;
        int invalidNum = 0;
        double result = 0;

        for (int i = 0; i < n; i++) {
            double number = Double.parseDouble(scanner.nextLine());
            if (number >= 0 && number < 10) {
                result += number * 0.2;
                num0To10++;
            } else if (number >= 10 && number < 20) {
                result += number * 0.3;
                num10To20++;
            } else if (number >= 20 && number < 30) {
                result += number * 0.4;
                num20To30++;
            } else if (number >= 30 && number < 40) {
                result += 50;
                num30To40++;
            } else if (number >= 40 && number <= 50) {
                result += 100;
                num40To50++;
            } else{
                result /= 2;
                invalidNum++;
            }
        }

        System.out.printf("%.2f\n", result);
        System.out.printf("From 0 to 9: %.2f%%\n", (double)num0To10 / n * 100);
        System.out.printf("From 10 to 19: %.2f%%\n", (double)num10To20 / n * 100);
        System.out.printf("From 20 to 29: %.2f%%\n",(double)num20To30 / n * 100);
        System.out.printf("From 30 to 39: %.2f%%\n", (double)num30To40 / n * 100);
        System.out.printf("From 40 to 50: %.2f%%\n", (double)num40To50 / n * 100);
        System.out.printf("Invalid numbers: %.2f%%\n", (double)invalidNum / n * 100);
    }
}