06. Cake

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

int main()
{
    int width, length;
    cin >> width >> length;
    //брой на парчетата: дълж * шир
    int countPieces = width * length;
    //STOP или броя парчетата < 0
    string command; //STOP ИЛИ ЧИСЛО под формата на текст
    cin >> command;

    //СПИРАМЕ: command == "STOP"
    //Продължаваме: command != "STOP"
    while (command != "STOP") {
        //брой парчета -> число -> "3"
        int takenPieces = stoi(command);
        countPieces -= takenPieces;
        if (countPieces < 0) {
            //-1
            cout << "No more cake left! You need " << abs(countPieces) << " pieces more." << endl;
            break;
        }

        cin >> command;
    }

    if (command == "STOP") {
        cout << countPieces << " pieces are left." << endl;
    }
}