Sum the Valid Numbers

Data typed by people is messy. You get a list of strings and must add up the ones that are whole numbers, ignoring the rest instead of crashing.

An entry counts if, after removing spaces at both ends, it is an optional + or - sign followed by one or more digits. Anything else (empty text, decimals such as "2.5", words) is skipped.

Implement sum_valid_numbers(values).

Input

values: The entries to read.

Output

Return the sum of the valid whole numbers (0 if there are none).

Einschränkungen

0 ≤ number of entries ≤ 1,000

Each entry has at most 20 characters; valid numbers fit in a 64-bit integer

Beispiele

Eingabe:
values = ["10", " 5 ", "abc", "-3"]

Erwartete Ausgabe:
expected = 12

Eingabe:
std::vector<std::string> values = {"10", " 5 ", "abc", "-3"};

Erwartete Ausgabe:
long long expected = 12;

Eingabe:
string[] values = new string[] {"10", " 5 ", "abc", "-3"};

Erwartete Ausgabe:
long expected = 12;

Eingabe:
values = ["2.5", "", "seven"]

Erwartete Ausgabe:
expected = 0

Eingabe:
std::vector<std::string> values = {"2.5", "", "seven"};

Erwartete Ausgabe:
long long expected = 0;

Eingabe:
string[] values = new string[] {"2.5", "", "seven"};

Erwartete Ausgabe:
long expected = 0;

Referenzen

Diese Aufgabe wurde für CodeUtility angepasst. Beachte die oben genannten Vorgaben und Einschränkungen.

• Python docs, Errors and Exceptions