Daily Coding Problem: Problem #974 [Hard]

Good morning! Here's your coding interview problem for today.

This problem was asked by Facebook.

Given a string consisting of parentheses, single digits, and positive and negative signs, convert the string into a mathematical expression to obtain the answer.

Don't use eval or a similar built-in parser.

For example, given '-1 + (2 + 3)', you should return 4.

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