Solution: Basic Calculator
Explore how to implement a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and nested parentheses. Understand how stacks can be used to manage intermediate calculations and nested subexpressions by pushing and popping results. This lesson guides you through building the solution step-by-step and explains its time and space complexity.
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