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Grokking the Coding Interview Patterns in C++

Basic Calculator

Explore how to implement a basic calculator that processes arithmetic expressions with integers, plus and minus operators, and parentheses. Understand how to use stacks to handle operator precedence and evaluate valid expressions efficiently within given constraints.

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Statement

Given a string containing an arithmetic expression, implement a basic calculator that evaluates the expression string. The expression string can contain integer numeric values and should be able to handle the “+” and “-” operators, as well as “()” parentheses.

Constraints:

Let s be the expression string. We can assume the following constraints:

  • 1≤1 \leq s.length ≤3×103\leq 3 \times 10^{3}
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