Solution: Basic Calculator
Explore how to solve a basic calculator problem that evaluates arithmetic expressions containing integers, + and - operators, and parentheses. This lesson helps you understand how to use the stack pattern to handle nested subexpressions by pushing and popping intermediate results. You will learn to parse and compute the expression efficiently in one pass, applying key stack operations to manage signs and parentheses, enabling you to solve similar coding interview problems with confidence.
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