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Bank Account Rules

Protect an account's balance behind deposit and withdraw rules, rejecting invalid operations.

Чему вы научитесь

  • Change state only through methods
  • Reject invalid amounts and overdrafts
  • Keep a count of rejected operations

Условие

Показать перевод

Encapsulation keeps an object's data private and only changes it through methods that enforce the rules. A bank account's balance can only change through deposit and withdraw.

Start with a balance of 0 and process the operations, each deposit <amount> or withdraw <amount>:

  • An amount that is 0 or negative is rejected.
  • A withdrawal larger than the current balance is rejected.
  • Otherwise the balance changes.

Implement bank_account_rules(operations).

Input

operations: The operations, in order.

Output

Return [final_balance, rejected_count].

Ограничения

0 ≤ number of operations ≤ 100,000

−10^9 ≤ amount ≤ 10^9

Примеры

Пример 1
Ввод:
operations = ["deposit 100", "withdraw 30", "withdraw 200"]

Ожидаемый вывод:
expected = [70, 1]
Ввод:
std::vector<std::string> operations = {"deposit 100", "withdraw 30", "withdraw 200"};

Ожидаемый вывод:
std::vector<long long> expected = {70, 1};
Ввод:
string[] operations = new string[] {"deposit 100", "withdraw 30", "withdraw 200"};

Ожидаемый вывод:
long[] expected = new long[] {70, 1};

Пояснение

100 − 30 leaves 70; withdrawing 200 would overdraw the account, so it is rejected: [70, 1].

Пример 2
Ввод:
operations = ["deposit -5", "withdraw 0", "deposit 10"]

Ожидаемый вывод:
expected = [10, 2]
Ввод:
std::vector<std::string> operations = {"deposit -5", "withdraw 0", "deposit 10"};

Ожидаемый вывод:
std::vector<long long> expected = {10, 2};
Ввод:
string[] operations = new string[] {"deposit -5", "withdraw 0", "deposit 10"};

Ожидаемый вывод:
long[] expected = new long[] {10, 2};

Пояснение

The negative deposit and the zero withdrawal are both rejected; the last deposit succeeds: [10, 2].

Как подступиться

Сначала попробуйте сами, затем открывайте подсказки по одной.

Подсказка 1

Keep the balance private and change it only in deposit and withdraw.

Подсказка 2

Reject amounts of 0 or less before anything else.

Подсказка 3

A withdrawal may not take the balance below zero.

Ожидаемая сложность

O(number of operations) time, O(1) extra space

Ссылки

Это задание адаптировано для CodeUtility. Следуйте условию и ограничениям выше.

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