Solution: Basic Calculator
Explore how to build a basic calculator that evaluates arithmetic expressions containing integers, addition, subtraction, and parentheses. This lesson teaches you to use stack data structures to manage nested subexpressions, evaluate partial results, and handle operator precedence. Understand the step-by-step solution and time-space complexity to confidently solve similar problems in coding interviews.
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:
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s.length