0856. Score of Parentheses

https://leetcode.com/problems/score-of-parentheses

Description

Given a balanced parentheses string s, return the score of the string.

The score of a balanced parentheses string is based on the following rule:

• "()" has score 1.

• AB has score A + B, where A and B are balanced parentheses strings.

• (A) has score 2 * A, where A is a balanced parentheses string.

Example 1:

**Input:** s = "()"
**Output:** 1

Example 2:

**Input:** s = "(())"
**Output:** 2

Example 3:

**Input:** s = "()()"
**Output:** 2

Example 4:

**Input:** s = "(()(()))"
**Output:** 6

Constraints:

• 2 <= s.length <= 50

• s consists of only '(' and ')'.

• s is a balanced parentheses string.

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