03. Logistics

#include <iostream>

using namespace std;

int main() {
    const int BUS_CARGO_PRICE_PER_TON = 200;
    const int TRUCK_CARGO_PRICE_PER_TON = 175;
    const int TRAIN_CARGO_PRICE_PER_TON = 120;

    int cargoCount;
    cin >> cargoCount;

    int busCargo = 0, truckCargo = 0, trainCargo = 0;

    int currentCargo;

    for (int i = 1; i <= cargoCount; i++) {
        cin >> currentCargo;

        if (currentCargo < 4) {
            busCargo += currentCargo;
        }
        else if (currentCargo < 12) {
            truckCargo += currentCargo;
        }
        else {
            trainCargo += currentCargo;
        }
    }

    int totalCargo = busCargo + truckCargo + trainCargo;

    double average = 1.0 * (busCargo * BUS_CARGO_PRICE_PER_TON + truckCargo * TRUCK_CARGO_PRICE_PER_TON + trainCargo * TRAIN_CARGO_PRICE_PER_TON) / totalCargo;

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

    cout << average << "\n";
    cout << 100.0 * busCargo / totalCargo << "%\n";
    cout << 100.0 * truckCargo / totalCargo << "%\n";
    cout << 100.0 * trainCargo / totalCargo << "%\n";

    return 0;
}

Решение с тернарен оператор:

#include <iostream>

using namespace std;

int main() {
    const int BUS_CARGO_PRICE_PER_TON = 200;
    const int TRUCK_CARGO_PRICE_PER_TON = 175;
    const int TRAIN_CARGO_PRICE_PER_TON = 120;

    int cargoCount;
    cin >> cargoCount;

    int busCargo = 0, truckCargo = 0, trainCargo = 0, currentCargo;

    for (int i = 1; i <= cargoCount; i++) {
        cin >> currentCargo;

        (currentCargo < 4 ? busCargo : currentCargo < 12 ? truckCargo : trainCargo) += currentCargo;
    }

    int totalCargo = busCargo + truckCargo + trainCargo;

    double average = 1.0 * (busCargo * BUS_CARGO_PRICE_PER_TON + truckCargo * TRUCK_CARGO_PRICE_PER_TON + trainCargo * TRAIN_CARGO_PRICE_PER_TON) / totalCargo;

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

    cout << average << "\n";
    cout << 100.0 * busCargo / totalCargo << "%\n";
    cout << 100.0 * truckCargo / totalCargo << "%\n";
    cout << 100.0 * trainCargo / totalCargo << "%\n";

    return 0;
}