leetcode-problemset/leetcode/originData/smallest-k-length-subsequence-with-occurrences-of-a-letter.json

{
    "data": {
        "question": {
            "questionId": "2157",
            "questionFrontendId": "2030",
            "boundTopicId": null,
            "title": "Smallest K-Length Subsequence With Occurrences of a Letter",
            "titleSlug": "smallest-k-length-subsequence-with-occurrences-of-a-letter",
            "content": "<p>You are given a string <code>s</code>, an integer <code>k</code>, a letter <code>letter</code>, and an integer <code>repetition</code>.</p>\n\n<p>Return <em>the <strong>lexicographically smallest</strong> subsequence of</em> <code>s</code><em> of length</em> <code>k</code> <em>that has the letter</em> <code>letter</code> <em>appear <strong>at least</strong></em> <code>repetition</code> <em>times</em>. The test cases are generated so that the <code>letter</code> appears in <code>s</code> <strong>at least</strong> <code>repetition</code> times.</p>\n\n<p>A <strong>subsequence</strong> is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.</p>\n\n<p>A string <code>a</code> is <strong>lexicographically smaller</strong> than a string <code>b</code> if in the first position where <code>a</code> and <code>b</code> differ, string <code>a</code> has a letter that appears earlier in the alphabet than the corresponding letter in <code>b</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;leet&quot;, k = 3, letter = &quot;e&quot;, repetition = 1\n<strong>Output:</strong> &quot;eet&quot;\n<strong>Explanation:</strong> There are four subsequences of length 3 that have the letter &#39;e&#39; appear at least 1 time:\n- &quot;lee&quot; (from &quot;<strong><u>lee</u></strong>t&quot;)\n- &quot;let&quot; (from &quot;<strong><u>le</u></strong>e<u><strong>t</strong></u>&quot;)\n- &quot;let&quot; (from &quot;<u><strong>l</strong></u>e<u><strong>et</strong></u>&quot;)\n- &quot;eet&quot; (from &quot;l<u><strong>eet</strong></u>&quot;)\nThe lexicographically smallest subsequence among them is &quot;eet&quot;.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"example-2\" src=\"https://assets.leetcode.com/uploads/2021/09/13/smallest-k-length-subsequence.png\" style=\"width: 339px; height: 67px;\" />\n<pre>\n<strong>Input:</strong> s = &quot;leetcode&quot;, k = 4, letter = &quot;e&quot;, repetition = 2\n<strong>Output:</strong> &quot;ecde&quot;\n<strong>Explanation:</strong> &quot;ecde&quot; is the lexicographically smallest subsequence of length 4 that has the letter &quot;e&quot; appear at least 2 times.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;bb&quot;, k = 2, letter = &quot;b&quot;, repetition = 2\n<strong>Output:</strong> &quot;bb&quot;\n<strong>Explanation:</strong> &quot;bb&quot; is the only subsequence of length 2 that has the letter &quot;b&quot; appear at least 2 times.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= repetition &lt;= k &lt;= s.length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n\t<li><code>letter</code> is a lowercase English letter, and appears in <code>s</code> at least <code>repetition</code> times.</li>\n</ul>\n",
            "translatedTitle": null,
            "translatedContent": null,
            "isPaidOnly": false,
            "difficulty": "Hard",
            "likes": 251,
            "dislikes": 6,
            "isLiked": null,
            "similarQuestions": "[{\"title\": \"Remove Duplicate Letters\", \"titleSlug\": \"remove-duplicate-letters\", \"difficulty\": \"Medium\", \"translatedTitle\": null}]",
            "exampleTestcases": "\"leet\"\n3\n\"e\"\n1\n\"leetcode\"\n4\n\"e\"\n2\n\"bb\"\n2\n\"b\"\n2",
            "categoryTitle": "Algorithms",
            "contributors": [],
            "topicTags": [
                {
                    "name": "String",
                    "slug": "string",
                    "translatedName": null,
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Stack",
                    "slug": "stack",
                    "translatedName": null,
                    "__typename": "TopicTagNode"
                },
                {
                    "name": "Greedy",
                    "slug": "greedy",
                    "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    string smallestSubsequence(string s, int k, char letter, int repetition) {\n        \n    }\n};",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class Solution {\n    public String smallestSubsequence(String s, int k, char letter, int repetition) {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class Solution(object):\n    def smallestSubsequence(self, s, k, letter, repetition):\n        \"\"\"\n        :type s: str\n        :type k: int\n        :type letter: str\n        :type repetition: int\n        :rtype: str\n        \"\"\"\n        ",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class Solution:\n    def smallestSubsequence(self, s: str, k: int, letter: str, repetition: int) -> str:\n        ",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\nchar * smallestSubsequence(char * s, int k, char letter, int repetition){\n\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class Solution {\n    public string SmallestSubsequence(string s, int k, char letter, int repetition) {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "/**\n * @param {string} s\n * @param {number} k\n * @param {character} letter\n * @param {number} repetition\n * @return {string}\n */\nvar smallestSubsequence = function(s, k, letter, repetition) {\n    \n};",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "# @param {String} s\n# @param {Integer} k\n# @param {Character} letter\n# @param {Integer} repetition\n# @return {String}\ndef smallest_subsequence(s, k, letter, repetition)\n    \nend",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "class Solution {\n    func smallestSubsequence(_ s: String, _ k: Int, _ letter: Character, _ repetition: Int) -> String {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "func smallestSubsequence(s string, k int, letter byte, repetition int) string {\n    \n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "object Solution {\n    def smallestSubsequence(s: String, k: Int, letter: Char, repetition: Int): String = {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class Solution {\n    fun smallestSubsequence(s: String, k: Int, letter: Char, repetition: Int): String {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "impl Solution {\n    pub fn smallest_subsequence(s: String, k: i32, letter: char, repetition: i32) -> String {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class Solution {\n\n    /**\n     * @param String $s\n     * @param Integer $k\n     * @param String $letter\n     * @param Integer $repetition\n     * @return String\n     */\n    function smallestSubsequence($s, $k, $letter, $repetition) {\n        \n    }\n}",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "function smallestSubsequence(s: string, k: number, letter: string, repetition: number): string {\n\n};",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define/contract (smallest-subsequence s k letter repetition)\n  (-> string? exact-integer? char? exact-integer? string?)\n\n  )",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec smallest_subsequence(S :: unicode:unicode_binary(), K :: integer(), Letter :: char(), Repetition :: integer()) -> unicode:unicode_binary().\nsmallest_subsequence(S, K, Letter, Repetition) ->\n  .",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule Solution do\n  @spec smallest_subsequence(s :: String.t, k :: integer, letter :: char, repetition :: integer) :: String.t\n  def smallest_subsequence(s, k, letter, repetition) do\n\n  end\nend",
                    "__typename": "CodeSnippetNode"
                }
            ],
            "stats": "{\"totalAccepted\": \"4.4K\", \"totalSubmission\": \"11.4K\", \"totalAcceptedRaw\": 4420, \"totalSubmissionRaw\": 11405, \"acRate\": \"38.8%\"}",
            "hints": [
                "Use stack. For every character to be appended, decide how many character(s) from the stack needs to get popped based on the stack length and the count of the required character.",
                "Pop the extra characters out from the stack and return the characters in the stack (reversed)."
            ],
            "solution": null,
            "status": null,
            "sampleTestCase": "\"leet\"\n3\n\"e\"\n1",
            "metaData": "{\n  \"name\": \"smallestSubsequence\",\n  \"params\": [\n    {\n      \"name\": \"s\",\n      \"type\": \"string\"\n    },\n    {\n      \"type\": \"integer\",\n      \"name\": \"k\"\n    },\n    {\n      \"type\": \"character\",\n      \"name\": \"letter\"\n    },\n    {\n      \"type\": \"integer\",\n      \"name\": \"repetition\"\n    }\n  ],\n  \"return\": {\n    \"type\": \"string\"\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++ 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://github.com/datastructures-js/queue\\\" target=\\\"_blank\\\">datastructures-js/queue</a>.</p>\"], \"ruby\": [\"Ruby\", \"<p><code>Ruby 3.1</code></p>\\r\\n\\r\\n<p>Some common data structure implementations are provided in the Algorithms module: https://www.rubydoc.info/github/kanwei/algorithms/Algorithms</p>\"], \"swift\": [\"Swift\", \"<p><code>Swift 5.5.2</code>.</p>\"], \"golang\": [\"Go\", \"<p><code>Go 1.17.6</code>.</p>\\r\\n\\r\\n<p>Support <a href=\\\"https://godoc.org/github.com/emirpasic/gods\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods</a> library.</p>\"], \"python3\": [\"Python3\", \"<p><code>Python 3.10</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/3/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/3/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/3/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>\"], \"scala\": [\"Scala\", \"<p><code>Scala 2.13.7</code>.</p>\"], \"kotlin\": [\"Kotlin\", \"<p><code>Kotlin 1.3.10</code>.</p>\"], \"rust\": [\"Rust\", \"<p><code>Rust 1.58.1</code></p>\\r\\n\\r\\n<p>Supports <a href=\\\"https://crates.io/crates/rand\\\" target=\\\"_blank\\\">rand </a> v0.6\\u00a0from crates.io</p>\"], \"php\": [\"PHP\", \"<p><code>PHP 8.1</code>.</p>\\r\\n<p>With bcmath module</p>\"], \"typescript\": [\"Typescript\", \"<p><code>TypeScript 4.5.4, 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 ES2020 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\"], \"racket\": [\"Racket\", \"<p>Run with <code>Racket 8.3</code>.</p>\"], \"erlang\": [\"Erlang\", \"Erlang/OTP 24.2\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.0 with Erlang/OTP 24.2\"]}",
            "libraryUrl": null,
            "adminUrl": null,
            "challengeQuestion": null,
            "__typename": "QuestionNode"
        }
    }
}