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).

सीमाएँ

0 ≤ number of entries ≤ 1,000

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

उदाहरण

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

अपेक्षित आउटपुट:
expected = 12

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

अपेक्षित आउटपुट:
long long expected = 12;

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

अपेक्षित आउटपुट:
long expected = 12;

इनपुट:
values = ["2.5", "", "seven"]

अपेक्षित आउटपुट:
expected = 0

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

अपेक्षित आउटपुट:
long long expected = 0;

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

अपेक्षित आउटपुट:
long expected = 0;

संदर्भ

यह चुनौती CodeUtility के लिए अनुकूलित की गई है। ऊपर दिए गए स्टेटमेंट और सीमाओं का पालन करें।

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