Basic Calculator at DoorDash

Hard46.5% acceptance

This problem has 50.0% frequency at DoorDash.

Problem Description

Given a string `s` representing a valid expression, implement a basic calculator to evaluate it, and return _the result of the evaluation_. **Note:** You are **not** allowed to use any built-in function which evaluates strings as mathematical expressions, such as `eval()`.

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Math String Stack Recursion

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Also asked at 23 companies

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