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DIY: Basic Calculator III

Understand how to evaluate complex mathematical expressions given as strings, including integers, operators, and parentheses. Learn to implement a calculator function that handles operator precedence and produces correct integer results, preparing you for similar coding interview challenges.

Problem statement

You are given a string s containing only positive integers, operators ('+', '-', '*', '/'), and parentheses '()'. The intermediate results of the given expression string are in the range [-2312^{31} ...