Solution: Basic Calculator
Explore how to implement a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and parentheses by applying the stack coding pattern. Understand step-by-step how to process nested subexpressions using push and pop operations to manage intermediate results effectively. This lesson helps you build a linear-time and space-efficient solution for this common coding interview problem.
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:
-
s.length