Sum a Flat JSON Object

Programs often receive JSON such as {"apples": 3, "pears": 5}. Libraries like System.Text.Json parse it for you, but parsing a simple case by hand shows how the format works.

The input is a flat JSON object: {, then zero or more "key": value pairs separated by commas, then }. Keys are quoted and contain no quotes, commas or colons; values are integers, possibly negative. Spaces may appear around any of the symbols.

Implement sum_json_numbers(text).

Input

text: The JSON object.

Output

Return the sum of all values (0 for an empty object).

Ограничения

2 ≤ length of text ≤ 100,000

At most 10,000 pairs; every value and the sum fit in a 64-bit integer

Примеры

Ввод:
text = "{\"apples\": 3, \"pears\": 5}"

Ожидаемый вывод:
expected = 8

Ввод:
std::string text = "{\"apples\": 3, \"pears\": 5}";

Ожидаемый вывод:
long long expected = 8;

Ввод:
string text = "{\"apples\": 3, \"pears\": 5}";

Ожидаемый вывод:
long expected = 8;

Ввод:
text = "{ \"debt\" : -20 , \"cash\":15 }"

Ожидаемый вывод:
expected = -5

Ввод:
std::string text = "{ \"debt\" : -20 , \"cash\":15 }";

Ожидаемый вывод:
long long expected = -5;

Ввод:
string text = "{ \"debt\" : -20 , \"cash\":15 }";

Ожидаемый вывод:
long expected = -5;

Ссылки

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

• Microsoft Learn, JSON serialization in .NET
• JSON specification (json.org)