Solution: Basic Calculator
Understand how to evaluate arithmetic expressions containing integers, plus and minus operators, and parentheses by applying a stack-based approach. This lesson guides you through building a solution that handles nested subexpressions and evaluates them efficiently in a single pass.
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