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Basic Calculator

Explore how to design a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and parentheses. Learn to apply stack principles to parse and compute valid expressions, accounting for unary minus and nested brackets efficiently.

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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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