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# 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.

## ac

```java
```