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g2001_2100.s2055_plates_between_candles.readme.md Maven / Gradle / Ivy

2055\. Plates Between Candles

Medium

There is a long table with a line of plates and candles arranged on top of it. You are given a **0-indexed** string `s` consisting of characters `'*'` and `'|'` only, where a `'*'` represents a **plate** and a `'|'` represents a **candle**.

You are also given a **0-indexed** 2D integer array `queries` where queries[i] = [lefti, righti] denotes the **substring** s[lefti...righti] (**inclusive**). For each query, you need to find the **number** of plates **between candles** that are **in the substring**. A plate is considered **between candles** if there is at least one candle to its left **and** at least one candle to its right **in the substring**.

*   For example, `s = "||**||**|*"`, and a query `[3, 8]` denotes the substring `"*||******|"`. The number of plates between candles in this substring is `2`, as each of the two plates has at least one candle **in the substring** to its left **and** right.

Return _an integer array_ `answer` _where_ `answer[i]` _is the answer to the_ ith _query_.

**Example 1:**

![ex-1](https://assets.leetcode.com/uploads/2021/10/04/ex-1.png)

**Input:** s = "\*\*|\*\*|\*\*\*|", queries = [[2,5],[5,9]]

**Output:** [2,3]

**Explanation:** - queries[0] has two plates between candles. - queries[1] has three plates between candles. 

**Example 2:**

![ex-2](https://assets.leetcode.com/uploads/2021/10/04/ex-2.png)

**Input:** s = "\*\*\*|\*\*|\*\*\*\*\*|\*\*||\*\*|\*", queries = [[1,17],[4,5],[14,17],[5,11],[15,16]]

**Output:** [9,0,0,0,0]

**Explanation:** - queries[0] has nine plates between candles. - The other queries have zero plates between candles. 

**Constraints:**

*   3 <= s.length <= 105
*   `s` consists of `'*'` and `'|'` characters.
*   1 <= queries.length <= 105
*   `queries[i].length == 2`
*   0 <= lefti <= righti < s.length