{ "data": { "question": { "questionId": "1097", "questionFrontendId": "1032", "categoryTitle": "Algorithms", "boundTopicId": 3689, "title": "Stream of Characters", "titleSlug": "stream-of-characters", "content": "

Design an algorithm that accepts a stream of characters and checks if a suffix of these characters is a string of a given array of strings words.

\n\n

For example, if words = ["abc", "xyz"] and the stream added the four characters (one by one) 'a', 'x', 'y', and 'z', your algorithm should detect that the suffix "xyz" of the characters "axyz" matches "xyz" from words.

\n\n

Implement the StreamChecker class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["StreamChecker", "query", "query", "query", "query", "query", "query", "query", "query", "query", "query", "query", "query"]\n[[["cd", "f", "kl"]], ["a"], ["b"], ["c"], ["d"], ["e"], ["f"], ["g"], ["h"], ["i"], ["j"], ["k"], ["l"]]\nOutput\n[null, false, false, false, true, false, true, false, false, false, false, false, true]\n\nExplanation\nStreamChecker streamChecker = new StreamChecker(["cd", "f", "kl"]);\nstreamChecker.query("a"); // return False\nstreamChecker.query("b"); // return False\nstreamChecker.query("c"); // return False\nstreamChecker.query("d"); // return True, because 'cd' is in the wordlist\nstreamChecker.query("e"); // return False\nstreamChecker.query("f"); // return True, because 'f' is in the wordlist\nstreamChecker.query("g"); // return False\nstreamChecker.query("h"); // return False\nstreamChecker.query("i"); // return False\nstreamChecker.query("j"); // return False\nstreamChecker.query("k"); // return False\nstreamChecker.query("l"); // return True, because 'kl' is in the wordlist\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "字符流", "translatedContent": "

设计一个算法：接收一个字符流，并检查这些字符的后缀是否是字符串数组 words 中的一个字符串。

\n\n

例如，words = [\"abc\", \"xyz\"] 且字符流中逐个依次加入 4 个字符 'a'、'x'、'y' 和 'z' ，你所设计的算法应当可以检测到 \"axyz\" 的后缀 \"xyz\" 与 words 中的字符串 \"xyz\" 匹配。

\n\n

按下述要求实现 StreamChecker 类：

\n\n\n\n

 

\n\n

示例：

\n\n
\n输入：\n[\"StreamChecker\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\", \"query\"]\n[[[\"cd\", \"f\", \"kl\"]], [\"a\"], [\"b\"], [\"c\"], [\"d\"], [\"e\"], [\"f\"], [\"g\"], [\"h\"], [\"i\"], [\"j\"], [\"k\"], [\"l\"]]\n输出：\n[null, false, false, false, true, false, true, false, false, false, false, false, true]\n\n解释：\nStreamChecker streamChecker = new StreamChecker([\"cd\", \"f\", \"kl\"]);\nstreamChecker.query(\"a\"); // 返回 False\nstreamChecker.query(\"b\"); // 返回 False\nstreamChecker.query(\"c\"); // 返回n False\nstreamChecker.query(\"d\"); // 返回 True ，因为 'cd' 在 words 中\nstreamChecker.query(\"e\"); // 返回 False\nstreamChecker.query(\"f\"); // 返回 True ，因为 'f' 在 words 中\nstreamChecker.query(\"g\"); // 返回 False\nstreamChecker.query(\"h\"); // 返回 False\nstreamChecker.query(\"i\"); // 返回 False\nstreamChecker.query(\"j\"); // 返回 False\nstreamChecker.query(\"k\"); // 返回 False\nstreamChecker.query(\"l\"); // 返回 True ，因为 'kl' 在 words 中\n
\n\n

 

\n\n

提示：

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"__typename": "TopicTagNode" }, { "name": "String", "slug": "string", "translatedName": "字符串", "__typename": "TopicTagNode" }, { "name": "Data Stream", "slug": "data-stream", "translatedName": "数据流", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class StreamChecker {\npublic:\n StreamChecker(vector& words) {\n \n }\n \n bool query(char letter) {\n \n }\n};\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker* obj = new StreamChecker(words);\n * bool param_1 = obj->query(letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class StreamChecker {\n\n public StreamChecker(String[] words) {\n \n }\n \n public boolean query(char letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker obj = new StreamChecker(words);\n * boolean param_1 = obj.query(letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class StreamChecker:\n\n def __init__(self, words: List[str]):\n \n\n def query(self, letter: str) -> bool:\n \n\n\n# Your StreamChecker object will be instantiated and called as such:\n# obj = StreamChecker(words)\n# param_1 = obj.query(letter)", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class StreamChecker(object):\n\n def __init__(self, words):\n \"\"\"\n :type words: List[str]\n \"\"\"\n \n\n def query(self, letter):\n \"\"\"\n :type letter: str\n :rtype: bool\n \"\"\"\n \n\n\n# Your StreamChecker object will be instantiated and called as such:\n# obj = StreamChecker(words)\n# param_1 = obj.query(letter)", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {string[]} words\n */\nvar StreamChecker = function(words) {\n \n};\n\n/** \n * @param {character} letter\n * @return {boolean}\n */\nStreamChecker.prototype.query = function(letter) {\n \n};\n\n/** \n * Your StreamChecker object will be instantiated and called as such:\n * var obj = new StreamChecker(words)\n * var param_1 = obj.query(letter)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class StreamChecker {\n constructor(words: string[]) {\n \n }\n\n query(letter: string): boolean {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * var obj = new StreamChecker(words)\n * var param_1 = obj.query(letter)\n */", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class StreamChecker {\n\n public StreamChecker(string[] words) {\n \n }\n \n public bool Query(char letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker obj = new StreamChecker(words);\n * bool param_1 = obj.Query(letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} StreamChecker;\n\n\nStreamChecker* streamCheckerCreate(char** words, int wordsSize) {\n \n}\n\nbool streamCheckerQuery(StreamChecker* obj, char letter) {\n \n}\n\nvoid streamCheckerFree(StreamChecker* obj) {\n \n}\n\n/**\n * Your StreamChecker struct will be instantiated and called as such:\n * StreamChecker* obj = streamCheckerCreate(words, wordsSize);\n * bool param_1 = streamCheckerQuery(obj, letter);\n \n * streamCheckerFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type StreamChecker struct {\n \n}\n\n\nfunc Constructor(words []string) StreamChecker {\n \n}\n\n\nfunc (this *StreamChecker) Query(letter byte) bool {\n \n}\n\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * obj := Constructor(words);\n * param_1 := obj.Query(letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class StreamChecker(words: Array) {\n\n fun query(letter: Char): Boolean {\n \n }\n\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * var obj = StreamChecker(words)\n * var param_1 = obj.query(letter)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass StreamChecker {\n\n init(_ words: [String]) {\n \n }\n \n func query(_ letter: Character) -> Bool {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * let obj = StreamChecker(words)\n * let ret_1: Bool = obj.query(letter)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct StreamChecker {\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 StreamChecker {\n\n fn new(words: Vec) -> Self {\n \n }\n \n fn query(&self, letter: char) -> bool {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * let obj = StreamChecker::new(words);\n * let ret_1: bool = obj.query(letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class StreamChecker\n\n=begin\n :type words: String[]\n=end\n def initialize(words)\n \n end\n\n\n=begin\n :type letter: Character\n :rtype: Boolean\n=end\n def query(letter)\n \n end\n\n\nend\n\n# Your StreamChecker object will be instantiated and called as such:\n# obj = StreamChecker.new(words)\n# param_1 = obj.query(letter)", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class StreamChecker {\n /**\n * @param String[] $words\n */\n function __construct($words) {\n \n }\n \n /**\n * @param String $letter\n * @return Boolean\n */\n function query($letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * $obj = StreamChecker($words);\n * $ret_1 = $obj->query($letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class StreamChecker {\n\n StreamChecker(List words) {\n \n }\n \n bool query(String letter) {\n \n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * StreamChecker obj = StreamChecker(words);\n * bool param1 = obj.query(letter);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class StreamChecker(_words: Array[String]) {\n\n def query(letter: Char): Boolean = {\n \n }\n\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * val obj = new StreamChecker(words)\n * val param_1 = obj.query(letter)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule StreamChecker do\n @spec init_(words :: [String.t]) :: any\n def init_(words) do\n \n end\n\n @spec query(letter :: char) :: boolean\n def query(letter) do\n \n end\nend\n\n# Your functions will be called as such:\n# StreamChecker.init_(words)\n# param_1 = StreamChecker.query(letter)\n\n# StreamChecker.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec stream_checker_init_(Words :: [unicode:unicode_binary()]) -> any().\nstream_checker_init_(Words) ->\n .\n\n-spec stream_checker_query(Letter :: char()) -> boolean().\nstream_checker_query(Letter) ->\n .\n\n\n%% Your functions will be called as such:\n%% stream_checker_init_(Words),\n%% Param_1 = stream_checker_query(Letter),\n\n%% stream_checker_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define stream-checker%\n (class object%\n (super-new)\n \n ; words : (listof string?)\n (init-field\n words)\n \n ; query : char? -> boolean?\n (define/public (query letter)\n )))\n\n;; Your stream-checker% object will be instantiated and called as such:\n;; (define obj (new stream-checker% [words words]))\n;; (define param_1 (send obj query letter))", "__typename": "CodeSnippetNode" }, { "lang": "Cangjie", "langSlug": "cangjie", "code": "class StreamChecker {\n init(words: Array) {\n\n }\n \n func query(letter: Rune): Bool {\n\n }\n}\n\n/**\n * Your StreamChecker object will be instantiated and called as such:\n * let obj: StreamChecker = StreamChecker(words)\n * let param_1 = obj.query(letter)\n */", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"21.4K\", \"totalSubmission\": \"37.5K\", \"totalAcceptedRaw\": 21400, \"totalSubmissionRaw\": 37542, \"acRate\": \"57.0%\"}", "hints": [ "Put the words into a trie, and manage a set of pointers within that trie." ], "solution": null, "status": null, "sampleTestCase": "[\"StreamChecker\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\",\"query\"]\n[[[\"cd\",\"f\",\"kl\"]],[\"a\"],[\"b\"],[\"c\"],[\"d\"],[\"e\"],[\"f\"],[\"g\"],[\"h\"],[\"i\"],[\"j\"],[\"k\"],[\"l\"]]", "metaData": "{\n \"classname\": \"StreamChecker\",\n \"maxbytesperline\": 500000,\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"string[]\",\n \"name\": \"words\"\n }]\n },\n \"methods\": [\n {\n \"name\" : \"query\",\n \"params\": [\n {\n \"type\": \"character\",\n \"name\": \"letter\"\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n }\n }\n ],\n \"systemdesign\": true,\n \"params\": [\n {\n \"name\": \"starts\",\n \"type\": \"integer[]\"\n },\n {\n \"name\": \"ends\",\n \"type\": \"integer[]\"\n }\n ],\n \"return\": {\n \"type\": \"list\",\n \"dealloc\": true\n }\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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