Solution: Basic Calculator
Explore how to evaluate arithmetic expressions involving integers, plus and minus operators, and nested parentheses using the stack pattern. This lesson guides you through parsing the expression, managing intermediate results with stack operations, and constructing an efficient solution 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