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Solution: Basic Calculator

Explore how to solve a basic calculator problem by using the stack pattern. This lesson helps you understand how to evaluate nested arithmetic expressions involving addition, subtraction, and parentheses. You will learn to process digits, operators, and parentheses systematically while maintaining intermediate results on a stack for accurate computation.

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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:

  • 1≤1 \leq s.length ≤3×103\leq 3 \times 10^{3}
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