Solution: Basic Calculator
Understand how to build a basic calculator that evaluates arithmetic expressions containing integers, addition, subtraction, and nested parentheses by using stack operations. This lesson guides you through processing the expression character by character, managing operands and signs, and handling nested subexpressions with push and pop operations. You will gain skills in algorithm design to parse and compute complex expressions with optimal 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