{ "data": { "question": { "questionId": "1211", "questionFrontendId": "1286", "categoryTitle": "Algorithms", "boundTopicId": 54015, "title": "Iterator for Combination", "titleSlug": "iterator-for-combination", "content": "

Design the CombinationIterator class:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput\n["CombinationIterator", "next", "hasNext", "next", "hasNext", "next", "hasNext"]\n[["abc", 2], [], [], [], [], [], []]\nOutput\n[null, "ab", true, "ac", true, "bc", false]\n\nExplanation\nCombinationIterator itr = new CombinationIterator("abc", 2);\nitr.next();    // return "ab"\nitr.hasNext(); // return True\nitr.next();    // return "ac"\nitr.hasNext(); // return True\nitr.next();    // return "bc"\nitr.hasNext(); // return False\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "字母组合迭代器", "translatedContent": "

请你设计一个迭代器类 CombinationIterator ，包括以下内容：

\n\n\n\n

 

\n\n

示例 1：

\n\n
\n输入:\n[\"CombinationIterator\", \"next\", \"hasNext\", \"next\", \"hasNext\", \"next\", \"hasNext\"]\n[[\"abc\", 2], [], [], [], [], [], []]\n输出：\n[null, \"ab\", true, \"ac\", true, \"bc\", false]\n解释：\nCombinationIterator iterator = new CombinationIterator(\"abc\", 2); // 创建迭代器 iterator\niterator.next(); // 返回 \"ab\"\niterator.hasNext(); // 返回 true\niterator.next(); // 返回 \"ac\"\niterator.hasNext(); // 返回 true\niterator.next(); // 返回 \"bc\"\niterator.hasNext(); // 返回 false\n
\n\n

 

\n\n

提示：

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"__typename": "TopicTagNode" }, { "name": "Iterator", "slug": "iterator", "translatedName": "迭代器", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class CombinationIterator {\npublic:\n CombinationIterator(string characters, int combinationLength) {\n\n }\n \n string next() {\n\n }\n \n bool hasNext() {\n\n }\n};\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * CombinationIterator* obj = new CombinationIterator(characters, combinationLength);\n * string param_1 = obj->next();\n * bool param_2 = obj->hasNext();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class CombinationIterator {\n\n public CombinationIterator(String characters, int combinationLength) {\n\n }\n \n public String next() {\n\n }\n \n public boolean hasNext() {\n\n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * CombinationIterator obj = new CombinationIterator(characters, combinationLength);\n * String param_1 = obj.next();\n * boolean param_2 = obj.hasNext();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class CombinationIterator(object):\n\n def __init__(self, characters, combinationLength):\n \"\"\"\n :type characters: str\n :type combinationLength: int\n \"\"\"\n\n\n def next(self):\n \"\"\"\n :rtype: str\n \"\"\"\n\n\n def hasNext(self):\n \"\"\"\n :rtype: bool\n \"\"\"\n\n\n\n# Your CombinationIterator object will be instantiated and called as such:\n# obj = CombinationIterator(characters, combinationLength)\n# param_1 = obj.next()\n# param_2 = obj.hasNext()", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class CombinationIterator:\n\n def __init__(self, characters: str, combinationLength: int):\n\n\n def next(self) -> str:\n\n\n def hasNext(self) -> bool:\n\n\n\n# Your CombinationIterator object will be instantiated and called as such:\n# obj = CombinationIterator(characters, combinationLength)\n# param_1 = obj.next()\n# param_2 = obj.hasNext()", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} CombinationIterator;\n\n\nCombinationIterator* combinationIteratorCreate(char* characters, int combinationLength) {\n \n}\n\nchar* combinationIteratorNext(CombinationIterator* obj) {\n \n}\n\nbool combinationIteratorHasNext(CombinationIterator* obj) {\n \n}\n\nvoid combinationIteratorFree(CombinationIterator* obj) {\n \n}\n\n/**\n * Your CombinationIterator struct will be instantiated and called as such:\n * CombinationIterator* obj = combinationIteratorCreate(characters, combinationLength);\n * char* param_1 = combinationIteratorNext(obj);\n \n * bool param_2 = combinationIteratorHasNext(obj);\n \n * combinationIteratorFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class CombinationIterator {\n\n public CombinationIterator(string characters, int combinationLength) {\n\n }\n \n public string Next() {\n\n }\n \n public bool HasNext() {\n\n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * CombinationIterator obj = new CombinationIterator(characters, combinationLength);\n * string param_1 = obj.Next();\n * bool param_2 = obj.HasNext();\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {string} characters\n * @param {number} combinationLength\n */\nvar CombinationIterator = function(characters, combinationLength) {\n\n};\n\n/**\n * @return {string}\n */\nCombinationIterator.prototype.next = function() {\n\n};\n\n/**\n * @return {boolean}\n */\nCombinationIterator.prototype.hasNext = function() {\n\n};\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * var obj = new CombinationIterator(characters, combinationLength)\n * var param_1 = obj.next()\n * var param_2 = obj.hasNext()\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class CombinationIterator {\n constructor(characters: string, combinationLength: number) {\n \n }\n\n next(): string {\n \n }\n\n hasNext(): boolean {\n \n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * var obj = new CombinationIterator(characters, combinationLength)\n * var param_1 = obj.next()\n * var param_2 = obj.hasNext()\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class CombinationIterator {\n /**\n * @param String $characters\n * @param Integer $combinationLength\n */\n function __construct($characters, $combinationLength) {\n\n }\n\n /**\n * @return String\n */\n function next() {\n\n }\n\n /**\n * @return Boolean\n */\n function hasNext() {\n\n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * $obj = CombinationIterator($characters, $combinationLength);\n * $ret_1 = $obj->next();\n * $ret_2 = $obj->hasNext();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass CombinationIterator {\n\n init(_ characters: String, _ combinationLength: Int) {\n\n }\n \n func next() -> String {\n\n }\n \n func hasNext() -> Bool {\n\n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * let obj = CombinationIterator(characters, combinationLength)\n * let ret_1: String = obj.next()\n * let ret_2: Bool = obj.hasNext()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class CombinationIterator(characters: String, combinationLength: Int) {\n\n fun next(): String {\n\n }\n\n fun hasNext(): Boolean {\n\n }\n\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * var obj = CombinationIterator(characters, combinationLength)\n * var param_1 = obj.next()\n * var param_2 = obj.hasNext()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class CombinationIterator {\n\n CombinationIterator(String characters, int combinationLength) {\n \n }\n \n String next() {\n \n }\n \n bool hasNext() {\n \n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * CombinationIterator obj = CombinationIterator(characters, combinationLength);\n * String param1 = obj.next();\n * bool param2 = obj.hasNext();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type CombinationIterator struct {\n\n}\n\n\nfunc Constructor(characters string, combinationLength int) CombinationIterator {\n\n}\n\n\nfunc (this *CombinationIterator) Next() string {\n\n}\n\n\nfunc (this *CombinationIterator) HasNext() bool {\n\n}\n\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * obj := Constructor(characters, combinationLength);\n * param_1 := obj.Next();\n * param_2 := obj.HasNext();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class CombinationIterator\n\n=begin\n :type characters: String\n :type combination_length: Integer\n=end\n def initialize(characters, combination_length)\n\n end\n\n\n=begin\n :rtype: String\n=end\n def next()\n\n end\n\n\n=begin\n :rtype: Boolean\n=end\n def has_next()\n\n end\n\n\nend\n\n# Your CombinationIterator object will be instantiated and called as such:\n# obj = CombinationIterator.new(characters, combination_length)\n# param_1 = obj.next()\n# param_2 = obj.has_next()", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class CombinationIterator(_characters: String, _combinationLength: Int) {\n\n def next(): String = {\n\n }\n\n def hasNext(): Boolean = {\n\n }\n\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * var obj = new CombinationIterator(characters, combinationLength)\n * var param_1 = obj.next()\n * var param_2 = obj.hasNext()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct CombinationIterator {\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 CombinationIterator {\n\n fn new(characters: String, combinationLength: i32) -> Self {\n\n }\n \n fn next(&self) -> String {\n\n }\n \n fn has_next(&self) -> bool {\n\n }\n}\n\n/**\n * Your CombinationIterator object will be instantiated and called as such:\n * let obj = CombinationIterator::new(characters, combinationLength);\n * let ret_1: String = obj.next();\n * let ret_2: bool = obj.has_next();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define combination-iterator%\n (class object%\n (super-new)\n \n ; characters : string?\n ; combination-length : exact-integer?\n (init-field\n characters\n combination-length)\n \n ; next : -> string?\n (define/public (next)\n )\n ; has-next : -> boolean?\n (define/public (has-next)\n )))\n\n;; Your combination-iterator% object will be instantiated and called as such:\n;; (define obj (new combination-iterator% [characters characters] [combination-length combination-length]))\n;; (define param_1 (send obj next))\n;; (define param_2 (send obj has-next))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec combination_iterator_init_(Characters :: unicode:unicode_binary(), CombinationLength :: integer()) -> any().\ncombination_iterator_init_(Characters, CombinationLength) ->\n .\n\n-spec combination_iterator_next() -> unicode:unicode_binary().\ncombination_iterator_next() ->\n .\n\n-spec combination_iterator_has_next() -> boolean().\ncombination_iterator_has_next() ->\n .\n\n\n%% Your functions will be called as such:\n%% combination_iterator_init_(Characters, CombinationLength),\n%% Param_1 = combination_iterator_next(),\n%% Param_2 = combination_iterator_has_next(),\n\n%% combination_iterator_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule CombinationIterator do\n @spec init_(characters :: String.t, combination_length :: integer) :: any\n def init_(characters, combination_length) do\n \n end\n\n @spec next() :: String.t\n def next() do\n \n end\n\n @spec has_next() :: boolean\n def has_next() do\n \n end\nend\n\n# Your functions will be called as such:\n# CombinationIterator.init_(characters, combination_length)\n# param_1 = CombinationIterator.next()\n# param_2 = CombinationIterator.has_next()\n\n# CombinationIterator.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], 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