05. Game Of Intervals

#include <iostream>

using namespace std;

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

    double result = 0, num0To10 = 0, num10To20 = 0, num20To30 = 0, num30To40 = 0, num40To50 = 0, invalidNum = 0, current;

    for (int i = 0; i < num; i++) {
        cin >> current;

        if (current >= 0 && current < 10) {
            result += current * 0.2;
            num0To10++;
        }
        else if (current >= 10 && current < 20) {
            result += current * 0.3;
            num10To20++;
        }
        else if (current >= 20 && current < 30) {
            result += current * 0.4;
            num20To30++;
        }
        else if (current >= 30 && current < 40) {
            result += 50;
            num30To40++;
        }
        else if (current >= 40 && current <= 50) {
            result += 100;
            num40To50++;
        }
        else {
            result /= 2;
            invalidNum++;
        }
    }

    cout.setf(ios::fixed);
    cout.precision(2);

    cout << result << "\n";
    cout << "From 0 to 9: " << 100.0 * num0To10 / num << "%\n";
    cout << "From 10 to 19: " << 100.0 * num10To20 / num << "%\n";
    cout << "From 20 to 29: " << 100 * num20To30 / num << "%\n";
    cout << "From 30 to 39: " << 100 * num30To40 / num << "%\n";
    cout << "From 40 to 50: " << 100 * num40To50 / num << "%\n";
    cout << "Invalid numbers: " << 100 * invalidNum / num << "%\n";

    return 0;
}

Решение с тернарен оператор:

#include <iostream>

using namespace std;

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

    double result = 0, num0To10 = 0, num10To20 = 0, num20To30 = 0, num30To40 = 0, num40To50 = 0, invalidNum = 0, current;

    for (int i = 0; i < num; i++) {
        cin >> current;

        result +=
            current >= 0 && current < 10 ? current * 0.2 :
            current >= 10 && current < 20 ? current * 0.3 :
            current >= 20 && current < 30 ? current * 0.4 :
            current >= 30 && current < 40 ? 50 :
            current >= 40 && current <= 50 ? 100 : -1.0 * result / 2;

        current >= 0 && current < 10 ? num0To10++ :
            current >= 10 && current < 20 ? num10To20++ :
            current >= 20 && current < 30 ? num20To30++ :
            current >= 30 && current < 40 ? num30To40++ :
            current >= 40 && current <= 50 ? num40To50++ : invalidNum++;
    }

    cout.setf(ios::fixed);
    cout.precision(2);

    cout << result << "\n";
    cout << "From 0 to 9: " << 100.0 * num0To10 / num << "%\n";
    cout << "From 10 to 19: " << 100.0 * num10To20 / num << "%\n";
    cout << "From 20 to 29: " << 100 * num20To30 / num << "%\n";
    cout << "From 30 to 39: " << 100 * num30To40 / num << "%\n";
    cout << "From 40 to 50: " << 100 * num40To50 / num << "%\n";
    cout << "Invalid numbers: " << 100 * invalidNum / num << "%\n";

    return 0;
}