mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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185 lines
17 KiB
JSON
185 lines
17 KiB
JSON
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"questionId": "2163",
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"questionFrontendId": "2053",
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"title": "Kth Distinct String in an Array",
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"titleSlug": "kth-distinct-string-in-an-array",
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"content": "<p>A <strong>distinct string</strong> is a string that is present only <strong>once</strong> in an array.</p>\n\n<p>Given an array of strings <code>arr</code>, and an integer <code>k</code>, return <em>the </em><code>k<sup>th</sup></code><em> <strong>distinct string</strong> present in </em><code>arr</code>. If there are <strong>fewer</strong> than <code>k</code> distinct strings, return <em>an <strong>empty string </strong></em><code>""</code>.</p>\n\n<p>Note that the strings are considered in the <strong>order in which they appear</strong> in the array.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = ["d","b","c","b","c","a"], k = 2\n<strong>Output:</strong> "a"\n<strong>Explanation:</strong>\nThe only distinct strings in arr are "d" and "a".\n"d" appears 1<sup>st</sup>, so it is the 1<sup>st</sup> distinct string.\n"a" appears 2<sup>nd</sup>, so it is the 2<sup>nd</sup> distinct string.\nSince k == 2, "a" is returned. \n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = ["aaa","aa","a"], k = 1\n<strong>Output:</strong> "aaa"\n<strong>Explanation:</strong>\nAll strings in arr are distinct, so the 1<sup>st</sup> string "aaa" is returned.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = ["a","b","a"], k = 3\n<strong>Output:</strong> ""\n<strong>Explanation:</strong>\nThe only distinct string is "b". Since there are fewer than 3 distinct strings, we return an empty string "".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= k <= arr.length <= 1000</code></li>\n\t<li><code>1 <= arr[i].length <= 5</code></li>\n\t<li><code>arr[i]</code> consists of lowercase English letters.</li>\n</ul>\n",
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"translatedTitle": null,
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"difficulty": "Easy",
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"likes": 715,
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"similarQuestions": "[{\"title\": \"Count Common Words With One Occurrence\", \"titleSlug\": \"count-common-words-with-one-occurrence\", \"difficulty\": \"Easy\", \"translatedTitle\": null}]",
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"exampleTestcases": "[\"d\",\"b\",\"c\",\"b\",\"c\",\"a\"]\n2\n[\"aaa\",\"aa\",\"a\"]\n1\n[\"a\",\"b\",\"a\"]\n3",
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"categoryTitle": "Algorithms",
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"name": "Array",
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"name": "Hash Table",
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"slug": "hash-table",
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"name": "String",
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"name": "Counting",
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"lang": "C++",
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"langSlug": "cpp",
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"code": "class Solution {\npublic:\n string kthDistinct(vector<string>& arr, int k) {\n \n }\n};",
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"__typename": "CodeSnippetNode"
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"lang": "Java",
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"code": "class Solution {\n public String kthDistinct(String[] arr, int k) {\n \n }\n}",
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"lang": "Python",
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"langSlug": "python",
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"code": "class Solution(object):\n def kthDistinct(self, arr, k):\n \"\"\"\n :type arr: List[str]\n :type k: int\n :rtype: str\n \"\"\"\n ",
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"code": "class Solution:\n def kthDistinct(self, arr: List[str], k: int) -> str:\n ",
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"lang": "C",
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"code": "char* kthDistinct(char** arr, int arrSize, int k) {\n \n}",
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"code": "public class Solution {\n public string KthDistinct(string[] arr, int k) {\n \n }\n}",
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"code": "/**\n * @param {string[]} arr\n * @param {number} k\n * @return {string}\n */\nvar kthDistinct = function(arr, k) {\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 String[] $arr\n * @param Integer $k\n * @return String\n */\n function kthDistinct($arr, $k) {\n \n }\n}",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Solution {\n fun kthDistinct(arr: Array<String>, k: Int): String {\n \n }\n}",
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"lang": "Dart",
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"langSlug": "dart",
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"code": "class Solution {\n String kthDistinct(List<String> arr, int k) {\n \n }\n}",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func kthDistinct(arr []string, k int) string {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {String[]} arr\n# @param {Integer} k\n# @return {String}\ndef kth_distinct(arr, k)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def kthDistinct(arr: Array[String], k: Int): String = {\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 kth_distinct(arr: Vec<String>, k: i32) -> String {\n \n }\n}",
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"langSlug": "racket",
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"code": "(define/contract (kth-distinct arr k)\n (-> (listof string?) exact-integer? string?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec kth_distinct(Arr :: [unicode:unicode_binary()], K :: integer()) -> unicode:unicode_binary().\nkth_distinct(Arr, K) ->\n .",
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"lang": "Elixir",
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"langSlug": "elixir",
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"code": "defmodule Solution do\n @spec kth_distinct(arr :: [String.t], k :: integer) :: String.t\n def kth_distinct(arr, k) do\n \n end\nend",
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"stats": "{\"totalAccepted\": \"54.6K\", \"totalSubmission\": \"75.5K\", \"totalAcceptedRaw\": 54580, \"totalSubmissionRaw\": 75467, \"acRate\": \"72.3%\"}",
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"hints": [
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"Try 'mapping' the strings to check if they are unique or not."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "[\"d\",\"b\",\"c\",\"b\",\"c\",\"a\"]\n2",
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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>. 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