How should I practice Parse a Signed 32-Bit Integer with Overflow Detection?

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Parse a Signed 32-Bit Integer with Overflow Detection

Microsoft● MediumNEW GRADONSITE INTERVIEW

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Problem statement

Given a nonempty decimal string s, parse it as a signed 32-bit integer.

The string may begin with one optional + or - sign, followed by one or more decimal digits. It contains no spaces or other characters. Return the canonical decimal representation of the parsed integer. If the value is outside [-2147483648, 2147483647], return "OVERFLOW".

Function

parseInt32(s: String) → String

Examples

Example 1

s = "-2147483648"return = "-2147483648"

The value equals the minimum signed 32-bit integer and is valid.

Example 2

s = "9999999999"return = "OVERFLOW"

The value exceeds the signed 32-bit maximum, so the runner exposes the required overflow exception as OVERFLOW.

Constraints

1 <= s.length <= 100000
After an optional leading sign, every character is a decimal digit.