Реализуйте банковский счёт. Операции operations: ["deposit", amount], ["withdraw", amount] (игнорируется, если недостаточно средств) или ["balance"]. Верните список результатов всех операций balance по порядку.
| Вход | Ожидаемый результат |
|---|
| [[["deposit", 100], ["withdraw", 30], ["balance"], ["withdraw", 1000], ["balance"]]] | [70, 70] |
| [[["balance"]]] | [0] |
| [[["deposit", 50], ["balance"]]] | [50] |
| [[["withdraw", 10], ["balance"]]] | [0] |
| [[["deposit", 100], ["deposit", 200], ["balance"]]] | [300] |
| [[["deposit", 100], ["withdraw", 100], ["balance"]]] | [0] |
| [[["deposit", 10], ["withdraw", 5], ["withdraw", 5], ["balance"]]] | [0] |
| [[["deposit", 1000], ["withdraw", 999], ["balance"]]] | [1] |
| [[["withdraw", 1], ["deposit", 1], ["balance"]]] | [1] |
| [[["deposit", 5], ["balance"], ["deposit", 5], ["balance"]]] | [5, 10] |