mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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189 lines
25 KiB
JSON
189 lines
25 KiB
JSON
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"categoryTitle": "Algorithms",
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"boundTopicId": 1072151,
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"title": "Plates Between Candles",
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"titleSlug": "plates-between-candles",
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"content": "<p>There is a long table with a line of plates and candles arranged on top of it. You are given a <strong>0-indexed</strong> string <code>s</code> consisting of characters <code>'*'</code> and <code>'|'</code> only, where a <code>'*'</code> represents a <strong>plate</strong> and a <code>'|'</code> represents a <strong>candle</strong>.</p>\n\n<p>You are also given a <strong>0-indexed</strong> 2D integer array <code>queries</code> where <code>queries[i] = [left<sub>i</sub>, right<sub>i</sub>]</code> denotes the <strong>substring</strong> <code>s[left<sub>i</sub>...right<sub>i</sub>]</code> (<strong>inclusive</strong>). For each query, you need to find the <strong>number</strong> of plates <strong>between candles</strong> that are <strong>in the substring</strong>. A plate is considered <strong>between candles</strong> if there is at least one candle to its left <strong>and</strong> at least one candle to its right <strong>in the substring</strong>.</p>\n\n<ul>\n\t<li>For example, <code>s = "||**||**|*"</code>, and a query <code>[3, 8]</code> denotes the substring <code>"*||<strong><u>**</u></strong>|"</code>. The number of plates between candles in this substring is <code>2</code>, as each of the two plates has at least one candle <strong>in the substring</strong> to its left <strong>and</strong> right.</li>\n</ul>\n\n<p>Return <em>an integer array</em> <code>answer</code> <em>where</em> <code>answer[i]</code> <em>is the answer to the</em> <code>i<sup>th</sup></code> <em>query</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"ex-1\" src=\"https://assets.leetcode.com/uploads/2021/10/04/ex-1.png\" style=\"width: 400px; height: 134px;\" />\n<pre>\n<strong>Input:</strong> s = "**|**|***|", queries = [[2,5],[5,9]]\n<strong>Output:</strong> [2,3]\n<strong>Explanation:</strong>\n- queries[0] has two plates between candles.\n- queries[1] has three plates between candles.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"ex-2\" src=\"https://assets.leetcode.com/uploads/2021/10/04/ex-2.png\" style=\"width: 600px; height: 193px;\" />\n<pre>\n<strong>Input:</strong> s = "***|**|*****|**||**|*", queries = [[1,17],[4,5],[14,17],[5,11],[15,16]]\n<strong>Output:</strong> [9,0,0,0,0]\n<strong>Explanation:</strong>\n- queries[0] has nine plates between candles.\n- The other queries have zero plates between candles.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 <= s.length <= 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of <code>'*'</code> and <code>'|'</code> characters.</li>\n\t<li><code>1 <= queries.length <= 10<sup>5</sup></code></li>\n\t<li><code>queries[i].length == 2</code></li>\n\t<li><code>0 <= left<sub>i</sub> <= right<sub>i</sub> < s.length</code></li>\n</ul>\n",
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"translatedTitle": "蜡烛之间的盘子",
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"translatedContent": "<p>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 <strong>0</strong> 开始的字符串 <code>s</code> ,它只包含字符 <code>'*'</code> 和 <code>'|'</code> ,其中 <code>'*'</code> 表示一个 <strong>盘子</strong> ,<code>'|'</code> 表示一支 <strong>蜡烛</strong> 。</p>\n\n<p>同时给你一个下标从 <strong>0</strong> 开始的二维整数数组 <code>queries</code> ,其中 <code>queries[i] = [left<sub>i</sub>, right<sub>i</sub>]</code> 表示 <strong>子字符串</strong> <code>s[left<sub>i</sub>...right<sub>i</sub>]</code> (<strong>包含左右端点的字符</strong>)。对于每个查询,你需要找到 <strong>子字符串中</strong> 在 <strong>两支蜡烛之间</strong> 的盘子的 <b>数目</b> 。如果一个盘子在 <strong>子字符串中</strong> 左边和右边 <strong>都</strong> 至少有一支蜡烛,那么这个盘子满足在 <strong>两支蜡烛之间</strong> 。</p>\n\n<ul>\n\t<li>比方说,<code>s = \"||**||**|*\"</code> ,查询 <code>[3, 8]</code> ,表示的是子字符串 <code>\"*||<strong><em>**</em></strong>|\"</code> 。子字符串中在两支蜡烛之间的盘子数目为 <code>2</code> ,子字符串中右边两个盘子在它们左边和右边 <strong>都 </strong>至少有一支蜡烛。</li>\n</ul>\n\n<p>请你返回一个整数数组 <code>answer</code> ,其中 <code>answer[i]</code> 是第 <code>i</code> 个查询的答案。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<p><img alt=\"ex-1\" src=\"https://assets.leetcode.com/uploads/2021/10/04/ex-1.png\" style=\"width: 400px; height: 134px;\"></p>\n\n<pre><b>输入:</b>s = \"**|**|***|\", queries = [[2,5],[5,9]]\n<b>输出:</b>[2,3]\n<b>解释:</b>\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</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<p><img alt=\"ex-2\" src=\"https://assets.leetcode.com/uploads/2021/10/04/ex-2.png\" style=\"width: 600px; height: 193px;\"></p>\n\n<pre><b>输入:</b>s = \"***|**|*****|**||**|*\", queries = [[1,17],[4,5],[14,17],[5,11],[15,16]]\n<b>输出:</b>[9,0,0,0,0]\n<strong>解释:</strong>\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</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>3 <= s.length <= 10<sup>5</sup></code></li>\n\t<li><code>s</code> 只包含字符 <code>'*'</code> 和 <code>'|'</code> 。</li>\n\t<li><code>1 <= queries.length <= 10<sup>5</sup></code></li>\n\t<li><code>queries[i].length == 2</code></li>\n\t<li><code>0 <= left<sub>i</sub> <= right<sub>i</sub> < s.length</code></li>\n</ul>\n",
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"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?",
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"Once the indices of the most left and right bars are determined, how can you efficiently count the number of plates within the range? Prefix sums?"
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