mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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198 lines
29 KiB
JSON
198 lines
29 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "1262",
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"questionFrontendId": "1157",
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"categoryTitle": "Algorithms",
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"boundTopicId": 19372,
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"title": "Online Majority Element In Subarray",
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"titleSlug": "online-majority-element-in-subarray",
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"content": "<p>Design a data structure that efficiently finds the <strong>majority element</strong> of a given subarray.</p>\n\n<p>The <strong>majority element</strong> of a subarray is an element that occurs <code>threshold</code> times or more in the subarray.</p>\n\n<p>Implementing the <code>MajorityChecker</code> class:</p>\n\n<ul>\n\t<li><code>MajorityChecker(int[] arr)</code> Initializes the instance of the class with the given array <code>arr</code>.</li>\n\t<li><code>int query(int left, int right, int threshold)</code> returns the element in the subarray <code>arr[left...right]</code> that occurs at least <code>threshold</code> times, or <code>-1</code> if no such element exists.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["MajorityChecker", "query", "query", "query"]\n[[[1, 1, 2, 2, 1, 1]], [0, 5, 4], [0, 3, 3], [2, 3, 2]]\n<strong>Output</strong>\n[null, 1, -1, 2]\n\n<strong>Explanation</strong>\nMajorityChecker majorityChecker = new MajorityChecker([1, 1, 2, 2, 1, 1]);\nmajorityChecker.query(0, 5, 4); // return 1\nmajorityChecker.query(0, 3, 3); // return -1\nmajorityChecker.query(2, 3, 2); // return 2\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= arr[i] <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>0 <= left <= right < arr.length</code></li>\n\t<li><code>threshold <= right - left + 1</code></li>\n\t<li><code>2 * threshold > right - left + 1</code></li>\n\t<li>At most <code>10<sup>4</sup></code> calls will be made to <code>query</code>.</li>\n</ul>\n",
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"translatedTitle": "子数组中占绝大多数的元素",
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"translatedContent": "<p>设计一个数据结构，有效地找到给定子数组的 <strong>多数元素</strong> 。</p>\n\n<p>子数组的 <strong>多数元素</strong> 是在子数组中出现 <code>threshold</code> 次数或次数以上的元素。</p>\n\n<p>实现 <code>MajorityChecker</code> 类:</p>\n\n<ul>\n\t<li><code>MajorityChecker(int[] arr)</code> 会用给定的数组 <code>arr</code> 对 <code>MajorityChecker</code> 初始化。</li>\n\t<li><code>int query(int left, int right, int threshold)</code> 返回子数组中的元素 <code>arr[left...right]</code> 至少出现 <code>threshold</code> 次数，如果不存在这样的元素则返回 <code>-1</code>。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入:</strong>\n[\"MajorityChecker\", \"query\", \"query\", \"query\"]\n[[[1, 1, 2, 2, 1, 1]], [0, 5, 4], [0, 3, 3], [2, 3, 2]]\n<strong>输出：</strong>\n[null, 1, -1, 2]\n\n<b>解释：</b>\nMajorityChecker majorityChecker = new MajorityChecker([1,1,2,2,1,1]);\nmajorityChecker.query(0,5,4); // 返回 1\nmajorityChecker.query(0,3,3); // 返回 -1\nmajorityChecker.query(2,3,2); // 返回 2\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= arr.length <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= arr[i] <= 2 * 10<sup>4</sup></code></li>\n\t<li><code>0 <= left <= right < arr.length</code></li>\n\t<li><code>threshold <= right - left + 1</code></li>\n\t<li><code>2 * threshold > right - left + 1</code></li>\n\t<li>调用 <code>query</code> 的次数最多为 <code>10<sup>4</sup></code> </li>\n</ul>\n",
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"code": "class MajorityChecker {\npublic:\n MajorityChecker(vector<int>& arr) {\n\n }\n \n int query(int left, int right, int threshold) {\n\n }\n};\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * MajorityChecker* obj = new MajorityChecker(arr);\n * int param_1 = obj->query(left,right,threshold);\n */",
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"code": "class MajorityChecker {\n\n public MajorityChecker(int[] arr) {\n\n }\n \n public int query(int left, int right, int threshold) {\n\n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * MajorityChecker obj = new MajorityChecker(arr);\n * int param_1 = obj.query(left,right,threshold);\n */",
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"code": "class MajorityChecker(object):\n\n def __init__(self, arr):\n \"\"\"\n :type arr: List[int]\n \"\"\"\n\n\n def query(self, left, right, threshold):\n \"\"\"\n :type left: int\n :type right: int\n :type threshold: int\n :rtype: int\n \"\"\"\n\n\n\n# Your MajorityChecker object will be instantiated and called as such:\n# obj = MajorityChecker(arr)\n# param_1 = obj.query(left,right,threshold)",
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"code": "class MajorityChecker:\n\n def __init__(self, arr: List[int]):\n\n\n def query(self, left: int, right: int, threshold: int) -> int:\n\n\n\n# Your MajorityChecker object will be instantiated and called as such:\n# obj = MajorityChecker(arr)\n# param_1 = obj.query(left,right,threshold)",
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"code": "\n\n\ntypedef struct {\n \n} MajorityChecker;\n\n\nMajorityChecker* majorityCheckerCreate(int* arr, int arrSize) {\n \n}\n\nint majorityCheckerQuery(MajorityChecker* obj, int left, int right, int threshold) {\n \n}\n\nvoid majorityCheckerFree(MajorityChecker* obj) {\n \n}\n\n/**\n * Your MajorityChecker struct will be instantiated and called as such:\n * MajorityChecker* obj = majorityCheckerCreate(arr, arrSize);\n * int param_1 = majorityCheckerQuery(obj, left, right, threshold);\n \n * majorityCheckerFree(obj);\n*/",
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"code": "public class MajorityChecker {\n\n public MajorityChecker(int[] arr) {\n\n }\n \n public int Query(int left, int right, int threshold) {\n\n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * MajorityChecker obj = new MajorityChecker(arr);\n * int param_1 = obj.Query(left,right,threshold);\n */",
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"code": "/**\n * @param {number[]} arr\n */\nvar MajorityChecker = function(arr) {\n\n};\n\n/** \n * @param {number} left \n * @param {number} right \n * @param {number} threshold\n * @return {number}\n */\nMajorityChecker.prototype.query = function(left, right, threshold) {\n\n};\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * var obj = new MajorityChecker(arr)\n * var param_1 = obj.query(left,right,threshold)\n */",
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"code": "class MajorityChecker {\n constructor(arr: number[]) {\n \n }\n\n query(left: number, right: number, threshold: number): number {\n \n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * var obj = new MajorityChecker(arr)\n * var param_1 = obj.query(left,right,threshold)\n */",
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"code": "class MajorityChecker {\n /**\n * @param Integer[] $arr\n */\n function __construct($arr) {\n\n }\n\n /**\n * @param Integer $left\n * @param Integer $right\n * @param Integer $threshold\n * @return Integer\n */\n function query($left, $right, $threshold) {\n\n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * $obj = MajorityChecker($arr);\n * $ret_1 = $obj->query($left, $right, $threshold);\n */",
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"code": "\nclass MajorityChecker {\n\n init(_ arr: [Int]) {\n\n }\n \n func query(_ left: Int, _ right: Int, _ threshold: Int) -> Int {\n\n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * let obj = MajorityChecker(arr)\n * let ret_1: Int = obj.query(left, right, threshold)\n */",
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"code": "class MajorityChecker(arr: IntArray) {\n\n fun query(left: Int, right: Int, threshold: Int): Int {\n\n }\n\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * var obj = MajorityChecker(arr)\n * var param_1 = obj.query(left,right,threshold)\n */",
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"code": "class MajorityChecker {\n\n MajorityChecker(List<int> arr) {\n \n }\n \n int query(int left, int right, int threshold) {\n \n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * MajorityChecker obj = MajorityChecker(arr);\n * int param1 = obj.query(left,right,threshold);\n */",
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"code": "type MajorityChecker struct {\n\n}\n\n\nfunc Constructor(arr []int) MajorityChecker {\n\n}\n\n\nfunc (this *MajorityChecker) Query(left int, right int, threshold int) int {\n\n}\n\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * obj := Constructor(arr);\n * param_1 := obj.Query(left,right,threshold);\n */",
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"code": "class MajorityChecker\n\n=begin\n :type arr: Integer[]\n=end\n def initialize(arr)\n\n end\n\n\n=begin\n :type left: Integer\n :type right: Integer\n :type threshold: Integer\n :rtype: Integer\n=end\n def query(left, right, threshold)\n\n end\n\n\nend\n\n# Your MajorityChecker object will be instantiated and called as such:\n# obj = MajorityChecker.new(arr)\n# param_1 = obj.query(left, right, threshold)",
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"code": "class MajorityChecker(_arr: Array[Int]) {\n\n def query(left: Int, right: Int, threshold: Int): Int = {\n\n }\n\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * var obj = new MajorityChecker(arr)\n * var param_1 = obj.query(left,right,threshold)\n */",
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"code": "struct MajorityChecker {\n\n}\n\n\n/**\n * `&self` means the method takes an immutable reference.\n * If you need a mutable reference, change it to `&mut self` instead.\n */\nimpl MajorityChecker {\n\n fn new(arr: Vec<i32>) -> Self {\n\n }\n \n fn query(&self, left: i32, right: i32, threshold: i32) -> i32 {\n\n }\n}\n\n/**\n * Your MajorityChecker object will be instantiated and called as such:\n * let obj = MajorityChecker::new(arr);\n * let ret_1: i32 = obj.query(left, right, threshold);\n */",
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"code": "defmodule MajorityChecker do\n @spec init_(arr :: [integer]) :: any\n def init_(arr) do\n \n end\n\n @spec query(left :: integer, right :: integer, threshold :: integer) :: integer\n def query(left, right, threshold) do\n \n end\nend\n\n# Your functions will be called as such:\n# MajorityChecker.init_(arr)\n# param_1 = MajorityChecker.query(left, right, threshold)\n\n# MajorityChecker.init_ will be called before every test case, in which you can do some necessary initializations.",
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"hints": [
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"What's special about a majority element ?",
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"A majority element appears more than half the length of the array number of times.",
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"If we tried a random index of the array, what's the probability that this index has a majority element ?",
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"It's more than 50% if that array has a majority element.",
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"Try a random index for a proper number of times so that the probability of not finding the answer tends to zero."
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"sampleTestCase": "[\"MajorityChecker\",\"query\",\"query\",\"query\"]\n[[[1,1,2,2,1,1]],[0,5,4],[0,3,3],[2,3,2]]",
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