mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
206 lines
21 KiB
JSON
206 lines
21 KiB
JSON
|
{
|
||
|
|
"data": {
|
||
|
|
"question": {
|
||
|
|
"questionId": "3181",
|
||
|
|
"questionFrontendId": "2940",
|
||
|
|
"boundTopicId": null,
|
||
|
|
"title": "Find Building Where Alice and Bob Can Meet",
|
||
|
|
"titleSlug": "find-building-where-alice-and-bob-can-meet",
|
||
|
|
"content": "<p>You are given a <strong>0-indexed</strong> array <code>heights</code> of positive integers, where <code>heights[i]</code> represents the height of the <code>i<sup>th</sup></code> building.</p>\n\n<p>If a person is in building <code>i</code>, they can move to any other building <code>j</code> if and only if <code>i < j</code> and <code>heights[i] < heights[j]</code>.</p>\n\n<p>You are also given another array <code>queries</code> where <code>queries[i] = [a<sub>i</sub>, b<sub>i</sub>]</code>. On the <code>i<sup>th</sup></code> query, Alice is in building <code>a<sub>i</sub></code> while Bob is in building <code>b<sub>i</sub></code>.</p>\n\n<p>Return <em>an array</em> <code>ans</code> <em>where</em> <code>ans[i]</code> <em>is <strong>the index of the leftmost building</strong> where Alice and Bob can meet on the</em> <code>i<sup>th</sup></code> <em>query</em>. <em>If Alice and Bob cannot move to a common building on query</em> <code>i</code>, <em>set</em> <code>ans[i]</code> <em>to</em> <code>-1</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> heights = [6,4,8,5,2,7], queries = [[0,1],[0,3],[2,4],[3,4],[2,2]]\n<strong>Output:</strong> [2,5,-1,5,2]\n<strong>Explanation:</strong> In the first query, Alice and Bob can move to building 2 since heights[0] < heights[2] and heights[1] < heights[2]. \nIn the second query, Alice and Bob can move to building 5 since heights[0] < heights[5] and heights[3] < heights[5]. \nIn the third query, Alice cannot meet Bob since Alice cannot move to any other building.\nIn the fourth query, Alice and Bob can move to building 5 since heights[3] < heights[5] and heights[4] < heights[5].\nIn the fifth query, Alice and Bob are already in the same building. \nFor ans[i] != -1, It can be shown that ans[i] is the leftmost building where Alice and Bob can meet.\nFor ans[i] == -1, It can be shown that there is no building where Alice and Bob can meet.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> heights = [5,3,8,2,6,1,4,6], queries = [[0,7],[3,5],[5,2],[3,0],[1,6]]\n<strong>Output:</strong> [7,6,-1,4,6]\n<strong>Explanation:</strong> In the first query, Alice can directly move to Bob's building since heights[0] < heights[7].\nIn the second query, Alice and Bob can move to building 6 since heights[3] < heights[6] and heights[5] < heights[6].\nIn the third query, Alice cannot meet Bob since Bob cannot move to any other building.\nIn the fourth query, Alice and Bob can move to building 4 since heights[3] < heights[4] and heights[0] < heights[4].\nIn the fifth query, Alice can directly move to Bob's building since heights[1] < heights[6].\nFor ans[i] != -1, It can be shown that ans[i] is the leftmost building where Alice and Bob can meet.\nFor ans[i] == -1, It can be shown that there is no building where Alice and Bob can meet.\n\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= heights.length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= heights[i] <= 10<sup>9</sup></code></li>\n\t<li><code>1 <= queries.length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>queries[i] = [a<sub>i</sub>, b<sub>i</sub>]</code></li>\n\t<li><code>0 <= a<sub>i</sub>, b<sub>i</sub> <= heights.length - 1</code></li>\n</ul>\n",
|
||
|
|
"translatedTitle": null,
|
||
|
|
"translatedContent": null,
|
||
|
|
"isPaidOnly": false,
|
||
|
|
"difficulty": "Hard",
|
||
|
|
"likes": 160,
|
||
|
|
"dislikes": 2,
|
||
|
|
"isLiked": null,
|
||
|
|
"similarQuestions": "[{\"title\": \"Number of Visible People in a Queue\", \"titleSlug\": \"number-of-visible-people-in-a-queue\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Furthest Building You Can Reach\", \"titleSlug\": \"furthest-building-you-can-reach\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]",
|
||
|
|
"exampleTestcases": "[6,4,8,5,2,7]\n[[0,1],[0,3],[2,4],[3,4],[2,2]]\n[5,3,8,2,6,1,4,6]\n[[0,7],[3,5],[5,2],[3,0],[1,6]]",
|
||
|
|
"categoryTitle": "Algorithms",
|
||
|
|
"contributors": [],
|
||
|
|
"topicTags": [
|
||
|
|
{
|
||
|
|
"name": "Array",
|
||
|
|
"slug": "array",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"name": "Binary Search",
|
||
|
|
"slug": "binary-search",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"name": "Stack",
|
||
|
|
"slug": "stack",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"name": "Binary Indexed Tree",
|
||
|
|
"slug": "binary-indexed-tree",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"name": "Segment Tree",
|
||
|
|
"slug": "segment-tree",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"name": "Heap (Priority Queue)",
|
||
|
|
"slug": "heap-priority-queue",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"name": "Monotonic Stack",
|
||
|
|
"slug": "monotonic-stack",
|
||
|
|
"translatedName": null,
|
||
|
|
"__typename": "TopicTagNode"
|
||
|
|
}
|
||
|
|
],
|
||
|
|
"companyTagStats": null,
|
||
|
|
"codeSnippets": [
|
||
|
|
{
|
||
|
|
"lang": "C++",
|
||
|
|
"langSlug": "cpp",
|
||
|
|
"code": "class Solution {\npublic:\n vector<int> leftmostBuildingQueries(vector<int>& heights, vector<vector<int>>& queries) {\n \n }\n};",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Java",
|
||
|
|
"langSlug": "java",
|
||
|
|
"code": "class Solution {\n public int[] leftmostBuildingQueries(int[] heights, int[][] queries) {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Python",
|
||
|
|
"langSlug": "python",
|
||
|
|
"code": "class Solution(object):\n def leftmostBuildingQueries(self, heights, queries):\n \"\"\"\n :type heights: List[int]\n :type queries: List[List[int]]\n :rtype: List[int]\n \"\"\"\n ",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Python3",
|
||
|
|
"langSlug": "python3",
|
||
|
|
"code": "class Solution:\n def leftmostBuildingQueries(self, heights: List[int], queries: List[List[int]]) -> List[int]:\n ",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "C",
|
||
|
|
"langSlug": "c",
|
||
|
|
"code": "/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nint* leftmostBuildingQueries(int* heights, int heightsSize, int** queries, int queriesSize, int* queriesColSize, int* returnSize) {\n \n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "C#",
|
||
|
|
"langSlug": "csharp",
|
||
|
|
"code": "public class Solution {\n public int[] LeftmostBuildingQueries(int[] heights, int[][] queries) {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "JavaScript",
|
||
|
|
"langSlug": "javascript",
|
||
|
|
"code": "/**\n * @param {number[]} heights\n * @param {number[][]} queries\n * @return {number[]}\n */\nvar leftmostBuildingQueries = function(heights, queries) {\n \n};",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "TypeScript",
|
||
|
|
"langSlug": "typescript",
|
||
|
|
"code": "function leftmostBuildingQueries(heights: number[], queries: number[][]): number[] {\n \n};",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "PHP",
|
||
|
|
"langSlug": "php",
|
||
|
|
"code": "class Solution {\n\n /**\n * @param Integer[] $heights\n * @param Integer[][] $queries\n * @return Integer[]\n */\n function leftmostBuildingQueries($heights, $queries) {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Swift",
|
||
|
|
"langSlug": "swift",
|
||
|
|
"code": "class Solution {\n func leftmostBuildingQueries(_ heights: [Int], _ queries: [[Int]]) -> [Int] {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Kotlin",
|
||
|
|
"langSlug": "kotlin",
|
||
|
|
"code": "class Solution {\n fun leftmostBuildingQueries(heights: IntArray, queries: Array<IntArray>): IntArray {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Dart",
|
||
|
|
"langSlug": "dart",
|
||
|
|
"code": "class Solution {\n List<int> leftmostBuildingQueries(List<int> heights, List<List<int>> queries) {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Go",
|
||
|
|
"langSlug": "golang",
|
||
|
|
"code": "func leftmostBuildingQueries(heights []int, queries [][]int) []int {\n \n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Ruby",
|
||
|
|
"langSlug": "ruby",
|
||
|
|
"code": "# @param {Integer[]} heights\n# @param {Integer[][]} queries\n# @return {Integer[]}\ndef leftmost_building_queries(heights, queries)\n \nend",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Scala",
|
||
|
|
"langSlug": "scala",
|
||
|
|
"code": "object Solution {\n def leftmostBuildingQueries(heights: Array[Int], queries: Array[Array[Int]]): Array[Int] = {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Rust",
|
||
|
|
"langSlug": "rust",
|
||
|
|
"code": "impl Solution {\n pub fn leftmost_building_queries(heights: Vec<i32>, queries: Vec<Vec<i32>>) -> Vec<i32> {\n \n }\n}",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Racket",
|
||
|
|
"langSlug": "racket",
|
||
|
|
"code": "(define/contract (leftmost-building-queries heights queries)\n (-> (listof exact-integer?) (listof (listof exact-integer?)) (listof exact-integer?))\n )",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Erlang",
|
||
|
|
"langSlug": "erlang",
|
||
|
|
"code": "-spec leftmost_building_queries(Heights :: [integer()], Queries :: [[integer()]]) -> [integer()].\nleftmost_building_queries(Heights, Queries) ->\n .",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
},
|
||
|
|
{
|
||
|
|
"lang": "Elixir",
|
||
|
|
"langSlug": "elixir",
|
||
|
|
"code": "defmodule Solution do\n @spec leftmost_building_queries(heights :: [integer], queries :: [[integer]]) :: [integer]\n def leftmost_building_queries(heights, queries) do\n \n end\nend",
|
||
|
|
"__typename": "CodeSnippetNode"
|
||
|
|
}
|
||
|
|
],
|
||
|
|
"stats": "{\"totalAccepted\": \"4.6K\", \"totalSubmission\": \"13.8K\", \"totalAcceptedRaw\": 4574, \"totalSubmissionRaw\": 13821, \"acRate\": \"33.1%\"}",
|
||
|
|
"hints": [
|
||
|
|
"For each query <code>[x, y]</code>, if <code>x > y</code>, swap <code>x</code> and <code>y</code>. Now, we can assume that <code>x <= y</code>.",
|
||
|
|
"For each query <code>[x, y]</code>, if <code>x == y</code> or <code>heights[x] < heights[y]</code>, then the answer is <code>y</code> since <code>x ≤ y</code>.",
|
||
|
|
"Otherwise, we need to find the smallest index <code>t</code> such that <code>y < t</code> and <code>heights[x] < heights[t]</code>. Note that <code>heights[y] <= heights[x]</code>, so <code>heights[x] < heights[t]</code> is a sufficient condition.",
|
||
|
|
"To find index <code>t</code> for each query, sort the queries in descending order of <code>y</code>. Iterate over the queries while maintaining a monotonic stack which we can binary search over to find index <code>t</code>."
|
||
|
|
],
|
||
|
|
"solution": null,
|
||
|
|
"status": null,
|
||
|
|
"sampleTestCase": "[6,4,8,5,2,7]\n[[0,1],[0,3],[2,4],[3,4],[2,2]]",
|
||
|
|
"metaData": "{\n \"name\": \"leftmostBuildingQueries\",\n \"params\": [\n {\n \"name\": \"heights\",\n \"type\": \"integer[]\"\n },\n {\n \"type\": \"integer[][]\",\n \"name\": \"queries\"\n }\n ],\n \"return\": {\n \"type\": \"integer[]\"\n }\n}",
|
||
|
|
"judgerAvailable": true,
|
||
|
|
"judgeType": "large",
|
||
|
|
"mysqlSchemas": [],
|
||
|
|
"enableRunCode": true,
|
||
|
|
"enableTestMode": false,
|
||
|
|
"enableDebugger": true,
|
||
|
|
"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 20 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 gnu11 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://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></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 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://githu
|
||
|
|
"libraryUrl": null,
|
||
|
|
"adminUrl": null,
|
||
|
|
"challengeQuestion": null,
|
||
|
|
"__typename": "QuestionNode"
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|