Problem 04 - Game Of Intervals

//URL FOR THE TASK: https://judge.softuni.bg/Contests/Practice/Index/480#3


#include <iostream>
#include <iomanip>
using namespace std;


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

    double total_num = 0;
    double first = 0;
    double second = 0;
    double third = 0;
    double fourht = 0;
    double fifth = 0;
    double invalid = 0;
    for (double i = 0; i < count; ++i)
    {
        double numbers;
        cin >> numbers;

        if (numbers >= 0 && numbers <= 9)
        {
            total_num = total_num + 0.2 * numbers;
            first++;
        }
        else if (numbers >= 10 && numbers <= 19)
        {
            total_num = total_num + 0.3 * numbers;
            second++;
        }
        else if (numbers >= 20 && numbers <= 29)
        {
            total_num = total_num + 0.4 * numbers;
            third++;
        }
        else if (numbers >= 30 && numbers <= 39)
        {
            total_num = total_num + 50;
            fourht++;
        }
        else if (numbers >= 40 && numbers <= 50)
        {
            total_num = total_num + 100;
            fifth++;
        }
        else if (numbers < 0 || numbers >50)
        {
            total_num /= 2;
            invalid++;
        }
    }

    cout << fixed << setprecision(2) << total_num << endl;
    cout << "From 0 to 9: " << fixed << setprecision(2) << first / count * 100 << "%" << endl;
    cout << "From 10 to 19: " << fixed << setprecision(2) << second / count * 100 << "%" << endl;
    cout << "From 20 to 29: " << fixed << setprecision(2) << third / count * 100 << "%" << endl;
    cout << "From 30 to 39: " << fixed << setprecision(2) << fourht / count * 100 << "%" << endl;
    cout << "From 40 to 50: " << fixed << setprecision(2) << fifth / count * 100 << "%" << endl;
    cout << "Invalid numbers: " << fixed << setprecision(2) << invalid / count * 100 << "%" << endl;
    return 0;
}