/** * ATM. * Initialize with a set of banknotes and currencies (e.g., 1000 rubles, 500 euros). * Banknotes are deducted from the ATM's stock upon dispensing. * Acceptable denominations: * --- 50R, 100R, 500R, 1000R, 5000R * --- 20 EUR, 100 EUR, 500 EUR * * Each currency is processed separately. * * The ATM can be used by many users simultaneously. * Multithreading support can be omitted (but it would be a plus). */ class ATM { public ??? withdraw(???) { // TODO implement } }