Solution: Basic Calculator
Explore how to implement a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and parentheses by using stacks. Understand step-by-step how to manage operands, operators, and nested subexpressions with push and pop operations. Gain the ability to process expressions in a single pass with O(n) time complexity, improving your skills in stack pattern applications for 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