Solution: Basic Calculator
Understand how to implement a basic calculator to evaluate arithmetic expressions containing addition, subtraction, and nested parentheses. Learn how to use the stack data structure to handle intermediate results and signs, process digits and operators, and efficiently compute the expression in one pass with clear 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