README.md

224. Basic Calculator

Topics

• Stack
• Math

Given a string s representing an expression, implement a basic calculator to evaluate it.

Example 1:

Input: s = "1 + 1"
Output: 2

Example 2:

Input: s = " 2-1 + 2 "
Output: 3

Example 3:

Input: s = "(1+(4+5+2)-3)+(6+8)"
Output: 23

Constraints:

• 1 <= s.length <= 3 * 10^5
• s consists of digits, '+', '-', '(', ')', and ' '.
• s represents a valid expression.