mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
174 lines
16 KiB
JSON
174 lines
16 KiB
JSON
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"title": "Maximum Number of Events That Can Be Attended",
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"content": "<p>You are given an array of <code>events</code> where <code>events[i] = [startDay<sub>i</sub>, endDay<sub>i</sub>]</code>. Every event <code>i</code> starts at <code>startDay<sub>i</sub></code><sub> </sub>and ends at <code>endDay<sub>i</sub></code>.</p>\n\n<p>You can attend an event <code>i</code> at any day <code>d</code> where <code>startTime<sub>i</sub> <= d <= endTime<sub>i</sub></code>. You can only attend one event at any time <code>d</code>.</p>\n\n<p>Return <em>the maximum number of events you can attend</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/02/05/e1.png\" style=\"width: 400px; height: 267px;\" />\n<pre>\n<strong>Input:</strong> events = [[1,2],[2,3],[3,4]]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> You can attend all the three events.\nOne way to attend them all is as shown.\nAttend the first event on day 1.\nAttend the second event on day 2.\nAttend the third event on day 3.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> events= [[1,2],[2,3],[3,4],[1,2]]\n<strong>Output:</strong> 4\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= events.length <= 10<sup>5</sup></code></li>\n\t<li><code>events[i].length == 2</code></li>\n\t<li><code>1 <= startDay<sub>i</sub> <= endDay<sub>i</sub> <= 10<sup>5</sup></code></li>\n</ul>\n",
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"exampleTestcases": "[[1,2],[2,3],[3,4]]\n[[1,2],[2,3],[3,4],[1,2]]",
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"categoryTitle": "Algorithms",
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"name": "Array",
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"name": "Greedy",
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"lang": "C++",
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"code": "class Solution {\npublic:\n int maxEvents(vector<vector<int>>& events) {\n \n }\n};",
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"code": "class Solution(object):\n def maxEvents(self, events):\n \"\"\"\n :type events: List[List[int]]\n :rtype: int\n \"\"\"\n ",
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"code": "\n\nint maxEvents(int** events, int eventsSize, int* eventsColSize){\n\n}",
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"lang": "C#",
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"code": "public class Solution {\n public int MaxEvents(int[][] events) {\n \n }\n}",
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"code": "/**\n * @param {number[][]} events\n * @return {number}\n */\nvar maxEvents = function(events) {\n \n};",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {Integer[][]} events\n# @return {Integer}\ndef max_events(events)\n \nend",
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"lang": "Swift",
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"langSlug": "swift",
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"code": "class Solution {\n func maxEvents(_ events: [[Int]]) -> Int {\n \n }\n}",
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"lang": "Go",
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"code": "func maxEvents(events [][]int) int {\n \n}",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def maxEvents(events: Array[Array[Int]]): Int = {\n \n }\n}",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Solution {\n fun maxEvents(events: Array<IntArray>): Int {\n \n }\n}",
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn max_events(events: Vec<Vec<i32>>) -> i32 {\n \n }\n}",
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"lang": "PHP",
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"langSlug": "php",
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"code": "class Solution {\n\n /**\n * @param Integer[][] $events\n * @return Integer\n */\n function maxEvents($events) {\n \n }\n}",
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"langSlug": "typescript",
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"code": "function maxEvents(events: number[][]): number {\n\n};",
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"code": "(define/contract (max-events events)\n (-> (listof (listof exact-integer?)) exact-integer?)\n\n )",
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"code": "-spec max_events(Events :: [[integer()]]) -> integer().\nmax_events(Events) ->\n .",
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"code": "defmodule Solution do\n @spec max_events(events :: [[integer]]) :: integer\n def max_events(events) do\n\n end\nend",
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"hints": [
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"Sort the events by the start time and in case of tie by the end time in ascending order.",
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"Loop over the sorted events. Attend as much as you can and keep the last day occupied. When you try to attend new event keep in mind the first day you can attend a new event in."
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code> OpenJDK 17 </code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu99 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n int id; /* we'll use this field as the key */\\r\\n char name[10];\\r\\n UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\\r\\n\\r\\n<p>Your code is compiled with debug flag enabled (<code>/debug</code>).</p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use <a href=\\\"https://github.com/datastructures-js/priority-queue\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and <a href=\\\"https:
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