{ "data": { "question": { "questionId": "2165", "questionFrontendId": "2055", "categoryTitle": "Algorithms", "boundTopicId": 1072151, "title": "Plates Between Candles", "titleSlug": "plates-between-candles", "content": "

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.

\n\n

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.

\n\n\n\n

Return an integer array answer where answer[i] is the answer to the ith query.

\n\n

 

\n

Example 1:

\n\"ex-1\"\n
\nInput: s = "**|**|***|", queries = [[2,5],[5,9]]\nOutput: [2,3]\nExplanation:\n- queries[0] has two plates between candles.\n- queries[1] has three plates between candles.\n
\n\n

Example 2:

\n\"ex-2\"\n
\nInput: s = "***|**|*****|**||**|*", queries = [[1,17],[4,5],[14,17],[5,11],[15,16]]\nOutput: [9,0,0,0,0]\nExplanation:\n- queries[0] has nine plates between candles.\n- The other queries have zero plates between candles.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "蜡烛之间的盘子", "translatedContent": "

给你一个长桌子，桌子上盘子和蜡烛排成一列。给你一个下标从 0 开始的字符串 s ，它只包含字符 '*' 和 '|' ，其中 '*' 表示一个 盘子 ，'|' 表示一支 蜡烛 。

\n\n

同时给你一个下标从 0 开始的二维整数数组 queries ，其中 queries[i] = [lefti, righti] 表示 子字符串 s[lefti...righti] （包含左右端点的字符）。对于每个查询，你需要找到 子字符串中 在 两支蜡烛之间 的盘子的 数目 。如果一个盘子在 子字符串中 左边和右边 都 至少有一支蜡烛，那么这个盘子满足在 两支蜡烛之间 。

\n\n\n\n

请你返回一个整数数组 answer ，其中 answer[i] 是第 i 个查询的答案。

\n\n

 

\n\n

示例 1:

\n\n

\"ex-1\"

\n\n
输入：s = \"**|**|***|\", queries = [[2,5],[5,9]]\n输出：[2,3]\n解释：\n- queries[0] 有两个盘子在蜡烛之间。\n- queries[1] 有三个盘子在蜡烛之间。\n
\n\n

示例 2:

\n\n

\"ex-2\"

\n\n
输入：s = \"***|**|*****|**||**|*\", queries = [[1,17],[4,5],[14,17],[5,11],[15,16]]\n输出：[9,0,0,0,0]\n解释：\n- queries[0] 有 9 个盘子在蜡烛之间。\n- 另一个查询没有盘子在蜡烛之间。\n
\n\n

 

\n\n

提示：

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(listof exact-integer?))\n\n )", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec plates_between_candles(S :: unicode:unicode_binary(), Queries :: [[integer()]]) -> [integer()].\nplates_between_candles(S, Queries) ->\n .", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule Solution do\n @spec plates_between_candles(s :: String.t, queries :: [[integer]]) :: [integer]\n def plates_between_candles(s, queries) do\n\n end\nend", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"31.7K\", \"totalSubmission\": \"73.3K\", \"totalAcceptedRaw\": 31698, \"totalSubmissionRaw\": 73296, \"acRate\": \"43.2%\"}", "hints": [ "Can you find the indices of the most left and right candles for a given substring, perhaps by using binary search (or better) over an array of indices of all the bars?", "Once the indices of the most left and right bars are determined, how can you efficiently count the number of plates within the range? 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