Stream of Characters
<p>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 <code>words</code>.</p>

<p>For example, if <code>words = [&quot;abc&quot;, &quot;xyz&quot;]</code>&nbsp;and the stream added the four characters (one by one) <code>&#39;a&#39;</code>, <code>&#39;x&#39;</code>, <code>&#39;y&#39;</code>, and <code>&#39;z&#39;</code>, your algorithm should detect that the suffix <code>&quot;xyz&quot;</code> of the characters <code>&quot;axyz&quot;</code> matches <code>&quot;xyz&quot;</code> from <code>words</code>.</p>

<p>Implement the <code>StreamChecker</code> class:</p>

<ul>
	<li><code>StreamChecker(String[] words)</code> Initializes the object with the strings array <code>words</code>.</li>
	<li><code>boolean query(char letter)</code> Accepts a new character from the stream and returns <code>true</code> if any non-empty suffix from the stream forms a word that is in <code>words</code>.</li>
</ul>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input</strong>
[&quot;StreamChecker&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;, &quot;query&quot;]
[[[&quot;cd&quot;, &quot;f&quot;, &quot;kl&quot;]], [&quot;a&quot;], [&quot;b&quot;], [&quot;c&quot;], [&quot;d&quot;], [&quot;e&quot;], [&quot;f&quot;], [&quot;g&quot;], [&quot;h&quot;], [&quot;i&quot;], [&quot;j&quot;], [&quot;k&quot;], [&quot;l&quot;]]
<strong>Output</strong>
[null, false, false, false, true, false, true, false, false, false, false, false, true]

<strong>Explanation</strong>
StreamChecker streamChecker = new StreamChecker([&quot;cd&quot;, &quot;f&quot;, &quot;kl&quot;]);
streamChecker.query(&quot;a&quot;); // return False
streamChecker.query(&quot;b&quot;); // return False
streamChecker.query(&quot;c&quot;); // return False
streamChecker.query(&quot;d&quot;); // return True, because &#39;cd&#39; is in the wordlist
streamChecker.query(&quot;e&quot;); // return False
streamChecker.query(&quot;f&quot;); // return True, because &#39;f&#39; is in the wordlist
streamChecker.query(&quot;g&quot;); // return False
streamChecker.query(&quot;h&quot;); // return False
streamChecker.query(&quot;i&quot;); // return False
streamChecker.query(&quot;j&quot;); // return False
streamChecker.query(&quot;k&quot;); // return False
streamChecker.query(&quot;l&quot;); // return True, because &#39;kl&#39; is in the wordlist
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= words.length &lt;= 2000</code></li>
	<li><code>1 &lt;= words[i].length &lt;= 200</code></li>
	<li><code>words[i]</code> consists of lowercase English letters.</li>
	<li><code>letter</code> is a lowercase English letter.</li>
	<li>At most <code>4 * 10<sup>4</sup></code> calls will be made to query.</li>
</ul>

[]
[]
[{"value": "cpp", "text": "C++", "defaultCode": "class StreamChecker {\npublic:\n    StreamChecker(vector<string>& 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 */"}, {"value": "java", "text": "Java", "defaultCode": "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 */"}, {"value": "python", "text": "Python", "defaultCode": "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)"}, {"value": "python3", "text": "Python3", "defaultCode": "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)"}, {"value": "c", "text": "C", "defaultCode": "\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*/"}, {"value": "csharp", "text": "C#", "defaultCode": "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 */"}, {"value": "javascript", "text": "JavaScript", "defaultCode": "/**\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 */"}, {"value": "typescript", "text": "TypeScript", "defaultCode": "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 */"}, {"value": "php", "text": "PHP", "defaultCode": "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 */"}, {"value": "swift", "text": "Swift", "defaultCode": "\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 */"}, {"value": "kotlin", "text": "Kotlin", "defaultCode": "class StreamChecker(words: Array<String>) {\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 */"}, {"value": "dart", "text": "Dart", "defaultCode": "class StreamChecker {\n\n  StreamChecker(List<String> 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 */"}, {"value": "golang", "text": "Go", "defaultCode": "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 */"}, {"value": "ruby", "text": "Ruby", "defaultCode": "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)"}, {"value": "scala", "text": "Scala", "defaultCode": "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 */"}, {"value": "rust", "text": "Rust", "defaultCode": "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<String>) -> 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 */"}, {"value": "racket", "text": "Racket", "defaultCode": "(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))"}, {"value": "erlang", "text": "Erlang", "defaultCode": "-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."}, {"value": "elixir", "text": "Elixir", "defaultCode": "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."}]
{
    "classname": "StreamChecker",
    "maxbytesperline": 500000,
    "constructor": {
        "params": [
            {
                "type": "string[]",
                "name": "words"
            }]
    },
    "methods": [
        {
            "name" : "query",
            "params": [
                {
                    "type": "character",
                    "name": "letter"
                }
            ],
            "return": {
                "type": "boolean"
            }
        }
    ],
    "systemdesign": true,
    "params": [
        {
            "name": "starts",
            "type": "integer[]"
        },
        {
            "name": "ends",
            "type": "integer[]"
        }
    ],
    "return": {
        "type": "list<boolean>",
        "dealloc": true
    }
}
{"cpp": ["C++", "<p>Compiled with <code> clang 19 </code> using the latest C++ 23 standard, and <code>libstdc++</code> provided by GCC 14.</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 21</code>. Using compile arguments: <code>--enable-preview --release 21</code></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 2.7.18</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\">is not maintained anymore</a>. For the latest Python, please choose Python3 instead.</p>"], "c": ["C", "<p>Compiled with <code>gcc 14</code> using the gnu11 standard.</p>\r\n\r\n<p>Your code is compiled with level one 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>\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-13\" target=\"_blank\">C# 13</a> with .NET 9 runtime</p>"], "javascript": ["JavaScript", "<p><code>Node.js 22.14.0</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 6.3.2 version of <a href=\"https://github.com/datastructures-js/priority-queue/tree/v6.3.2\" target=\"_blank\">datastructures-js/priority-queue</a> and 4.2.3 version of <a href=\"https://github.com/datastructures-js/queue/tree/v4.2.3\" target=\"_blank\">datastructures-js/queue</a> and 1.0.4 version of <a href=\"https://github.com/datastructures-js/deque/tree/v1.0.4\" target=\"_blank\">datastructures-js/deque</a>.</p>"], "ruby": ["Ruby", "<p><code>Ruby 3.2</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 6.0</code>.</p>\r\n\r\n<p>You may use the following packages:<br/>\r\n<a href=\"https://github.com/apple/swift-algorithms/tree/1.2.0\" target=\"_blank\">swift-algorithms 1.2.0</a><br/>\r\n<a href=\"https://github.com/apple/swift-collections/tree/1.1.4\" target=\"_blank\">swift-collections 1.1.4</a><br/>\r\n<a href=\"https://github.com/apple/swift-numerics/tree/1.0.2\" target=\"_blank\">swift-numerics 1.0.2</a></p>"], "golang": ["Go", "<p><code>Go 1.23</code></p>\r\n<p>Support <a href=\"https://pkg.go.dev/github.com/emirpasic/gods@v1.18.1\" target=\"_blank\">https://pkg.go.dev/github.com/emirpasic/gods@v1.18.1</a> and <a href=\"https://pkg.go.dev/github.com/emirpasic/gods/v2@v2.0.0-alpha\" target=\"_blank\">https://pkg.go.dev/github.com/emirpasic/gods/v2@v2.0.0-alpha</a> library.</p>"], "python3": ["Python3", "<p><code>Python 3.11</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 3.3.1</code>.</p>"], "kotlin": ["Kotlin", "<p><code>Kotlin 2.1.10</code>.</p>"], "rust": ["Rust", "<p><code>Rust 1.85.0</code>. Your code will be compiled with <code>opt-level</code> 2.</p>\r\n\r\n<p>Supports <a href=\"https://crates.io/crates/rand\" target=\"_blank\">rand v0.8</a> and <a href=\"https://crates.io/crates/regex\" target=\"_blank\">regex\u00a0v1</a> and <a href=\"https://crates.io/crates/itertools\" target=\"_blank\">itertools\u00a0v0.14</a> from crates.io</p>"], "php": ["PHP", "<p><code>PHP 8.2</code>.</p>\r\n<p>With bcmath module</p>"], "typescript": ["Typescript", "<p><code>TypeScript 5.7.3, Node.js 22.14.0</code>.</p>\r\n\r\n<p>Compile Options: <code>--alwaysStrict --strictBindCallApply --strictFunctionTypes --target ES2024</code></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 6.3.2 version of <a href=\"https://github.com/datastructures-js/priority-queue/tree/v6.3.2\" target=\"_blank\">datastructures-js/priority-queue</a> and 4.2.3 version of <a href=\"https://github.com/datastructures-js/queue/tree/v4.2.3\" target=\"_blank\">datastructures-js/queue</a> and 1.0.4 version of <a href=\"https://github.com/datastructures-js/deque/tree/v1.0.4\" target=\"_blank\">datastructures-js/deque</a>.</p>"], "racket": ["Racket", "<p><a href=\"https://docs.racket-lang.org/guide/performance.html#%28tech._c%29\" target=\"_blank\">Racket CS</a> v8.15</p>\r\n\r\n<p>Using <code>#lang racket</code></p>\r\n\r\n<p>Required <code>data/gvector data/queue data/order data/heap</code> automatically for your convenience</p>"], "erlang": ["Erlang", "Erlang/OTP 26"], "elixir": ["Elixir", "Elixir 1.17 with Erlang/OTP 26"], "dart": ["Dart", "<p>Dart 3.2. You may use package <a href=\"https://pub.dev/packages/collection/versions/1.18.0\" target=\"_blank\">collection</a></p>\r\n\r\n<p>Your code will be run directly without compiling</p>"]}
['Array', 'String', 'Design', 'Trie', 'Data Stream']