Solution: Basic Calculator
Explore how to implement a basic calculator that evaluates arithmetic expressions containing integers, plus, minus operators, and nested parentheses. Learn to use stacks to handle subexpressions, manage signs, and track intermediate results efficiently. This lesson helps you understand stack operations critical for parsing and solving these expressions correctly with linear time 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