mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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190 lines
25 KiB
JSON
190 lines
25 KiB
JSON
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"questionId": "2833",
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"questionFrontendId": "2747",
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"categoryTitle": "Algorithms",
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"boundTopicId": 2317723,
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"title": "Count Zero Request Servers",
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"titleSlug": "count-zero-request-servers",
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"content": "<p>You are given an integer <code>n</code> denoting the total number of servers and a <strong>2D</strong> <strong>0-indexed </strong>integer array <code>logs</code>, where <code>logs[i] = [server_id, time]</code> denotes that the server with id <code>server_id</code> received a request at time <code>time</code>.</p>\n\n<p>You are also given an integer <code>x</code> and a <strong>0-indexed</strong> integer array <code>queries</code>.</p>\n\n<p>Return <em>a <strong>0-indexed</strong> integer array</em> <code>arr</code> <em>of length</em> <code>queries.length</code> <em>where</em> <code>arr[i]</code> <em>represents the number of servers that <strong>did not receive</strong> any requests during the time interval</em> <code>[queries[i] - x, queries[i]]</code>.</p>\n\n<p>Note that the time intervals are inclusive.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, logs = [[1,3],[2,6],[1,5]], x = 5, queries = [10,11]\n<strong>Output:</strong> [1,2]\n<strong>Explanation:</strong> \nFor queries[0]: The servers with ids 1 and 2 get requests in the duration of [5, 10]. Hence, only server 3 gets zero requests.\nFor queries[1]: Only the server with id 2 gets a request in duration of [6,11]. Hence, the servers with ids 1 and 3 are the only servers that do not receive any requests during that time period.\n\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3, logs = [[2,4],[2,1],[1,2],[3,1]], x = 2, queries = [3,4]\n<strong>Output:</strong> [0,1]\n<strong>Explanation:</strong> \nFor queries[0]: All servers get at least one request in the duration of [1, 3].\nFor queries[1]: Only server with id 3 gets no request in the duration [2,4].\n\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= logs.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= queries.length <= 10<sup>5</sup></code></li>\n\t<li><code><font face=\"monospace\">logs[i].length == 2</font></code></li>\n\t<li><code>1 <= logs[i][0] <= n</code></li>\n\t<li><code>1 <= logs[i][1] <= 10<sup>6</sup></code></li>\n\t<li><code>1 <= x <= 10<sup>5</sup></code></li>\n\t<li><code>x < queries[i] <= 10<sup>6</sup></code></li>\n</ul>\n",
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"translatedTitle": "统计没有收到请求的服务器数目",
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"translatedContent": "<p>给你一个整数 <code>n</code> ，表示服务器的总数目，再给你一个下标从 <strong>0</strong> 开始的 <strong>二维</strong> 整数数组 <code>logs</code> ，其中 <code>logs[i] = [server_id, time]</code> 表示 id 为 <code>server_id</code> 的服务器在 <code>time</code> 时收到了一个请求。</p>\n\n<p>同时给你一个整数 <code>x</code> 和一个下标从 <strong>0</strong> 开始的整数数组 <code>queries</code> 。</p>\n\n<p>请你返回一个长度等于 <code>queries.length</code> 的数组 <code>arr</code> ，其中 <code>arr[i]</code> 表示在时间区间 <code>[queries[i] - x, queries[i]]</code> 内没有收到请求的服务器数目。</p>\n\n<p>注意时间区间是个闭区间。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<b>输入：</b>n = 3, logs = [[1,3],[2,6],[1,5]], x = 5, queries = [10,11]\n<b>输出：</b>[1,2]\n<b>解释：</b>\n对于 queries[0]：id 为 1 和 2 的服务器在区间 [5, 10] 内收到了请求，所以只有服务器 3 没有收到请求。\n对于 queries[1]：id 为 2 的服务器在区间 [6,11] 内收到了请求，所以 id 为 1 和 3 的服务器在这个时间段内没有收到请求。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<b>输入：</b>n = 3, logs = [[2,4],[2,1],[1,2],[3,1]], x = 2, queries = [3,4]\n<b>输出：</b>[0,1]\n<b>解释：</b>\n对于 queries[0]：区间 [1, 3] 内所有服务器都收到了请求。\n对于 queries[1]：只有 id 为 3 的服务器在区间 [2,4] 内没有收到请求。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= n <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= logs.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= queries.length <= 10<sup>5</sup></code></li>\n\t<li><code>logs[i].length == 2</code></li>\n\t<li><code>1 <= logs[i][0] <= n</code></li>\n\t<li><code>1 <= logs[i][1] <= 10<sup>6</sup></code></li>\n\t<li><code>1 <= x <= 10<sup>5</sup></code></li>\n\t<li><code>x < queries[i] <= 10<sup>6</sup></code></li>\n</ul>\n",
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"Can we use sorting and two-pointer approach here?",
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"Sort the queries array and logs array based on time in increasing order.",
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