{ "data": { "question": { "questionId": "860", "questionFrontendId": "622", "categoryTitle": "Algorithms", "boundTopicId": 1129, "title": "Design Circular Queue", "titleSlug": "design-circular-queue", "content": "

Design your implementation of the circular queue. The circular queue is a linear data structure in which the operations are performed based on FIFO (First In First Out) principle and the last position is connected back to the first position to make a circle. It is also called "Ring Buffer".

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One of the benefits of the circular queue is that we can make use of the spaces in front of the queue. In a normal queue, once the queue becomes full, we cannot insert the next element even if there is a space in front of the queue. But using the circular queue, we can use the space to store new values.

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Implementation the MyCircularQueue class:

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You must solve the problem without using the built-in queue data structure in your programming language. 

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Example 1:

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\nInput\n["MyCircularQueue", "enQueue", "enQueue", "enQueue", "enQueue", "Rear", "isFull", "deQueue", "enQueue", "Rear"]\n[[3], [1], [2], [3], [4], [], [], [], [4], []]\nOutput\n[null, true, true, true, false, 3, true, true, true, 4]\n\nExplanation\nMyCircularQueue myCircularQueue = new MyCircularQueue(3);\nmyCircularQueue.enQueue(1); // return True\nmyCircularQueue.enQueue(2); // return True\nmyCircularQueue.enQueue(3); // return True\nmyCircularQueue.enQueue(4); // return False\nmyCircularQueue.Rear();     // return 3\nmyCircularQueue.isFull();   // return True\nmyCircularQueue.deQueue();  // return True\nmyCircularQueue.enQueue(4); // return True\nmyCircularQueue.Rear();     // return 4\n
\n\n

 

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Constraints:

\n\n\n", "translatedTitle": "设计循环队列", "translatedContent": "

设计你的循环队列实现。 循环队列是一种线性数据结构，其操作表现基于 FIFO（先进先出）原则并且队尾被连接在队首之后以形成一个循环。它也被称为“环形缓冲器”。

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循环队列的一个好处是我们可以利用这个队列之前用过的空间。在一个普通队列里，一旦一个队列满了，我们就不能插入下一个元素，即使在队列前面仍有空间。但是使用循环队列，我们能使用这些空间去存储新的值。

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你的实现应该支持如下操作：

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示例：

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MyCircularQueue circularQueue = new MyCircularQueue(3); // 设置长度为 3\ncircularQueue.enQueue(1);  // 返回 true\ncircularQueue.enQueue(2);  // 返回 true\ncircularQueue.enQueue(3);  // 返回 true\ncircularQueue.enQueue(4);  // 返回 false，队列已满\ncircularQueue.Rear();  // 返回 3\ncircularQueue.isFull();  // 返回 true\ncircularQueue.deQueue();  // 返回 true\ncircularQueue.enQueue(4);  // 返回 true\ncircularQueue.Rear();  // 返回 4
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提示：

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"TopicTagNode" }, { "name": "Array", "slug": "array", "translatedName": "数组", "__typename": "TopicTagNode" }, { "name": "Linked List", "slug": "linked-list", "translatedName": "链表", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class MyCircularQueue {\npublic:\n MyCircularQueue(int k) {\n\n }\n \n bool enQueue(int value) {\n\n }\n \n bool deQueue() {\n\n }\n \n int Front() {\n\n }\n \n int Rear() {\n\n }\n \n bool isEmpty() {\n\n }\n \n bool isFull() {\n\n }\n};\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * MyCircularQueue* obj = new MyCircularQueue(k);\n * bool param_1 = obj->enQueue(value);\n * bool param_2 = obj->deQueue();\n * int param_3 = obj->Front();\n * int param_4 = obj->Rear();\n * bool param_5 = obj->isEmpty();\n * bool param_6 = obj->isFull();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class MyCircularQueue {\n\n public MyCircularQueue(int k) {\n\n }\n \n public boolean enQueue(int value) {\n\n }\n \n public boolean deQueue() {\n\n }\n \n public int Front() {\n\n }\n \n public int Rear() {\n\n }\n \n public boolean isEmpty() {\n\n }\n \n public boolean isFull() {\n\n }\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * MyCircularQueue obj = new MyCircularQueue(k);\n * boolean param_1 = obj.enQueue(value);\n * boolean param_2 = obj.deQueue();\n * int param_3 = obj.Front();\n * int param_4 = obj.Rear();\n * boolean param_5 = obj.isEmpty();\n * boolean param_6 = obj.isFull();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class MyCircularQueue(object):\n\n def __init__(self, k):\n \"\"\"\n :type k: int\n \"\"\"\n\n\n def enQueue(self, value):\n \"\"\"\n :type value: int\n :rtype: bool\n \"\"\"\n\n\n def deQueue(self):\n \"\"\"\n :rtype: bool\n \"\"\"\n\n\n def Front(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n def Rear(self):\n \"\"\"\n :rtype: int\n \"\"\"\n\n\n def isEmpty(self):\n \"\"\"\n :rtype: bool\n \"\"\"\n\n\n def isFull(self):\n \"\"\"\n :rtype: bool\n \"\"\"\n\n\n\n# Your MyCircularQueue object will be instantiated and called as such:\n# obj = MyCircularQueue(k)\n# param_1 = obj.enQueue(value)\n# param_2 = obj.deQueue()\n# param_3 = obj.Front()\n# param_4 = obj.Rear()\n# param_5 = obj.isEmpty()\n# param_6 = obj.isFull()", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class MyCircularQueue:\n\n def __init__(self, k: int):\n\n\n def enQueue(self, value: int) -> bool:\n\n\n def deQueue(self) -> bool:\n\n\n def Front(self) -> int:\n\n\n def Rear(self) -> int:\n\n\n def isEmpty(self) -> bool:\n\n\n def isFull(self) -> bool:\n\n\n\n# Your MyCircularQueue object will be instantiated and called as such:\n# obj = MyCircularQueue(k)\n# param_1 = obj.enQueue(value)\n# param_2 = obj.deQueue()\n# param_3 = obj.Front()\n# param_4 = obj.Rear()\n# param_5 = obj.isEmpty()\n# param_6 = obj.isFull()", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} MyCircularQueue;\n\n\nMyCircularQueue* myCircularQueueCreate(int k) {\n\n}\n\nbool myCircularQueueEnQueue(MyCircularQueue* obj, int value) {\n\n}\n\nbool myCircularQueueDeQueue(MyCircularQueue* obj) {\n\n}\n\nint myCircularQueueFront(MyCircularQueue* obj) {\n\n}\n\nint myCircularQueueRear(MyCircularQueue* obj) {\n\n}\n\nbool myCircularQueueIsEmpty(MyCircularQueue* obj) {\n\n}\n\nbool myCircularQueueIsFull(MyCircularQueue* obj) {\n\n}\n\nvoid myCircularQueueFree(MyCircularQueue* obj) {\n\n}\n\n/**\n * Your MyCircularQueue struct will be instantiated and called as such:\n * MyCircularQueue* obj = myCircularQueueCreate(k);\n * bool param_1 = myCircularQueueEnQueue(obj, value);\n \n * bool param_2 = myCircularQueueDeQueue(obj);\n \n * int param_3 = myCircularQueueFront(obj);\n \n * int param_4 = myCircularQueueRear(obj);\n \n * bool param_5 = myCircularQueueIsEmpty(obj);\n \n * bool param_6 = myCircularQueueIsFull(obj);\n \n * myCircularQueueFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class MyCircularQueue {\n\n public MyCircularQueue(int k) {\n\n }\n \n public bool EnQueue(int value) {\n\n }\n \n public bool DeQueue() {\n\n }\n \n public int Front() {\n\n }\n \n public int Rear() {\n\n }\n \n public bool IsEmpty() {\n\n }\n \n public bool IsFull() {\n\n }\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * MyCircularQueue obj = new MyCircularQueue(k);\n * bool param_1 = obj.EnQueue(value);\n * bool param_2 = obj.DeQueue();\n * int param_3 = obj.Front();\n * int param_4 = obj.Rear();\n * bool param_5 = obj.IsEmpty();\n * bool param_6 = obj.IsFull();\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} k\n */\nvar MyCircularQueue = function(k) {\n\n};\n\n/** \n * @param {number} value\n * @return {boolean}\n */\nMyCircularQueue.prototype.enQueue = function(value) {\n\n};\n\n/**\n * @return {boolean}\n */\nMyCircularQueue.prototype.deQueue = function() {\n\n};\n\n/**\n * @return {number}\n */\nMyCircularQueue.prototype.Front = function() {\n\n};\n\n/**\n * @return {number}\n */\nMyCircularQueue.prototype.Rear = function() {\n\n};\n\n/**\n * @return {boolean}\n */\nMyCircularQueue.prototype.isEmpty = function() {\n\n};\n\n/**\n * @return {boolean}\n */\nMyCircularQueue.prototype.isFull = function() {\n\n};\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * var obj = new MyCircularQueue(k)\n * var param_1 = obj.enQueue(value)\n * var param_2 = obj.deQueue()\n * var param_3 = obj.Front()\n * var param_4 = obj.Rear()\n * var param_5 = obj.isEmpty()\n * var param_6 = obj.isFull()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class MyCircularQueue\n\n=begin\n :type k: Integer\n=end\n def initialize(k)\n\n end\n\n\n=begin\n :type value: Integer\n :rtype: Boolean\n=end\n def en_queue(value)\n\n end\n\n\n=begin\n :rtype: Boolean\n=end\n def de_queue()\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def front()\n\n end\n\n\n=begin\n :rtype: Integer\n=end\n def rear()\n\n end\n\n\n=begin\n :rtype: Boolean\n=end\n def is_empty()\n\n end\n\n\n=begin\n :rtype: Boolean\n=end\n def is_full()\n\n end\n\n\nend\n\n# Your MyCircularQueue object will be instantiated and called as such:\n# obj = MyCircularQueue.new(k)\n# param_1 = obj.en_queue(value)\n# param_2 = obj.de_queue()\n# param_3 = obj.front()\n# param_4 = obj.rear()\n# param_5 = obj.is_empty()\n# param_6 = obj.is_full()", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass MyCircularQueue {\n\n init(_ k: Int) {\n\n }\n \n func enQueue(_ value: Int) -> Bool {\n\n }\n \n func deQueue() -> Bool {\n\n }\n \n func Front() -> Int {\n\n }\n \n func Rear() -> Int {\n\n }\n \n func isEmpty() -> Bool {\n\n }\n \n func isFull() -> Bool {\n\n }\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * let obj = MyCircularQueue(k)\n * let ret_1: Bool = obj.enQueue(value)\n * let ret_2: Bool = obj.deQueue()\n * let ret_3: Int = obj.Front()\n * let ret_4: Int = obj.Rear()\n * let ret_5: Bool = obj.isEmpty()\n * let ret_6: Bool = obj.isFull()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type MyCircularQueue struct {\n\n}\n\n\nfunc Constructor(k int) MyCircularQueue {\n\n}\n\n\nfunc (this *MyCircularQueue) EnQueue(value int) bool {\n\n}\n\n\nfunc (this *MyCircularQueue) DeQueue() bool {\n\n}\n\n\nfunc (this *MyCircularQueue) Front() int {\n\n}\n\n\nfunc (this *MyCircularQueue) Rear() int {\n\n}\n\n\nfunc (this *MyCircularQueue) IsEmpty() bool {\n\n}\n\n\nfunc (this *MyCircularQueue) IsFull() bool {\n\n}\n\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * obj := Constructor(k);\n * param_1 := obj.EnQueue(value);\n * param_2 := obj.DeQueue();\n * param_3 := obj.Front();\n * param_4 := obj.Rear();\n * param_5 := obj.IsEmpty();\n * param_6 := obj.IsFull();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class MyCircularQueue(_k: Int) {\n\n def enQueue(value: Int): Boolean = {\n\n }\n\n def deQueue(): Boolean = {\n\n }\n\n def Front(): Int = {\n\n }\n\n def Rear(): Int = {\n\n }\n\n def isEmpty(): Boolean = {\n\n }\n\n def isFull(): Boolean = {\n\n }\n\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * var obj = new MyCircularQueue(k)\n * var param_1 = obj.enQueue(value)\n * var param_2 = obj.deQueue()\n * var param_3 = obj.Front()\n * var param_4 = obj.Rear()\n * var param_5 = obj.isEmpty()\n * var param_6 = obj.isFull()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class MyCircularQueue(k: Int) {\n\n fun enQueue(value: Int): Boolean {\n\n }\n\n fun deQueue(): Boolean {\n\n }\n\n fun Front(): Int {\n\n }\n\n fun Rear(): Int {\n\n }\n\n fun isEmpty(): Boolean {\n\n }\n\n fun isFull(): Boolean {\n\n }\n\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * var obj = MyCircularQueue(k)\n * var param_1 = obj.enQueue(value)\n * var param_2 = obj.deQueue()\n * var param_3 = obj.Front()\n * var param_4 = obj.Rear()\n * var param_5 = obj.isEmpty()\n * var param_6 = obj.isFull()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct MyCircularQueue {\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 MyCircularQueue {\n\n fn new(k: i32) -> Self {\n\n }\n \n fn en_queue(&self, value: i32) -> bool {\n\n }\n \n fn de_queue(&self) -> bool {\n\n }\n \n fn front(&self) -> i32 {\n\n }\n \n fn rear(&self) -> i32 {\n\n }\n \n fn is_empty(&self) -> bool {\n\n }\n \n fn is_full(&self) -> bool {\n\n }\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * let obj = MyCircularQueue::new(k);\n * let ret_1: bool = obj.en_queue(value);\n * let ret_2: bool = obj.de_queue();\n * let ret_3: i32 = obj.front();\n * let ret_4: i32 = obj.rear();\n * let ret_5: bool = obj.is_empty();\n * let ret_6: bool = obj.is_full();\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class MyCircularQueue {\n /**\n * @param Integer $k\n */\n function __construct($k) {\n\n }\n\n /**\n * @param Integer $value\n * @return Boolean\n */\n function enQueue($value) {\n\n }\n\n /**\n * @return Boolean\n */\n function deQueue() {\n\n }\n\n /**\n * @return Integer\n */\n function Front() {\n\n }\n\n /**\n * @return Integer\n */\n function Rear() {\n\n }\n\n /**\n * @return Boolean\n */\n function isEmpty() {\n\n }\n\n /**\n * @return Boolean\n */\n function isFull() {\n\n }\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * $obj = MyCircularQueue($k);\n * $ret_1 = $obj->enQueue($value);\n * $ret_2 = $obj->deQueue();\n * $ret_3 = $obj->Front();\n * $ret_4 = $obj->Rear();\n * $ret_5 = $obj->isEmpty();\n * $ret_6 = $obj->isFull();\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class MyCircularQueue {\n constructor(k: number) {\n\n }\n\n enQueue(value: number): boolean {\n\n }\n\n deQueue(): boolean {\n\n }\n\n Front(): number {\n\n }\n\n Rear(): number {\n\n }\n\n isEmpty(): boolean {\n\n }\n\n isFull(): boolean {\n\n }\n}\n\n/**\n * Your MyCircularQueue object will be instantiated and called as such:\n * var obj = new MyCircularQueue(k)\n * var param_1 = obj.enQueue(value)\n * var param_2 = obj.deQueue()\n * var param_3 = obj.Front()\n * var param_4 = obj.Rear()\n * var param_5 = obj.isEmpty()\n * var param_6 = obj.isFull()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define my-circular-queue%\n (class object%\n (super-new)\n\n ; k : exact-integer?\n (init-field\n k)\n \n ; en-queue : exact-integer? -> boolean?\n (define/public (en-queue value)\n\n )\n ; de-queue : -> boolean?\n (define/public (de-queue)\n\n )\n ; front : -> exact-integer?\n (define/public (front)\n\n )\n ; rear : -> exact-integer?\n (define/public (rear)\n\n )\n ; is-empty : -> boolean?\n (define/public (is-empty)\n\n )\n ; is-full : -> boolean?\n (define/public (is-full)\n\n )))\n\n;; Your my-circular-queue% object will be instantiated and called as such:\n;; (define obj (new my-circular-queue% [k k]))\n;; (define param_1 (send obj en-queue value))\n;; (define param_2 (send obj de-queue))\n;; (define param_3 (send obj front))\n;; (define param_4 (send obj rear))\n;; (define param_5 (send obj is-empty))\n;; (define param_6 (send obj is-full))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec my_circular_queue_init_(K :: integer()) -> any().\nmy_circular_queue_init_(K) ->\n .\n\n-spec my_circular_queue_en_queue(Value :: integer()) -> boolean().\nmy_circular_queue_en_queue(Value) ->\n .\n\n-spec my_circular_queue_de_queue() -> boolean().\nmy_circular_queue_de_queue() ->\n .\n\n-spec my_circular_queue_front() -> integer().\nmy_circular_queue_front() ->\n .\n\n-spec my_circular_queue_rear() -> integer().\nmy_circular_queue_rear() ->\n .\n\n-spec my_circular_queue_is_empty() -> boolean().\nmy_circular_queue_is_empty() ->\n .\n\n-spec my_circular_queue_is_full() -> boolean().\nmy_circular_queue_is_full() ->\n .\n\n\n%% Your functions will be called as such:\n%% my_circular_queue_init_(K),\n%% Param_1 = my_circular_queue_en_queue(Value),\n%% Param_2 = my_circular_queue_de_queue(),\n%% Param_3 = my_circular_queue_front(),\n%% Param_4 = my_circular_queue_rear(),\n%% Param_5 = my_circular_queue_is_empty(),\n%% Param_6 = my_circular_queue_is_full(),\n\n%% my_circular_queue_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule MyCircularQueue do\n @spec init_(k :: integer) :: any\n def init_(k) do\n\n end\n\n @spec en_queue(value :: integer) :: boolean\n def en_queue(value) do\n\n end\n\n @spec de_queue() :: boolean\n def de_queue() do\n\n end\n\n @spec front() :: integer\n def front() do\n\n end\n\n @spec rear() :: integer\n def rear() do\n\n end\n\n @spec is_empty() :: boolean\n def is_empty() do\n\n end\n\n @spec is_full() :: boolean\n def is_full() do\n\n end\nend\n\n# Your functions will be called as such:\n# MyCircularQueue.init_(k)\n# param_1 = MyCircularQueue.en_queue(value)\n# param_2 = MyCircularQueue.de_queue()\n# param_3 = MyCircularQueue.front()\n# param_4 = MyCircularQueue.rear()\n# param_5 = MyCircularQueue.is_empty()\n# param_6 = MyCircularQueue.is_full()\n\n# MyCircularQueue.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"80.3K\", \"totalSubmission\": \"180.9K\", \"totalAcceptedRaw\": 80255, \"totalSubmissionRaw\": 180901, \"acRate\": \"44.4%\"}", "hints": [], "solution": null, "status": null, "sampleTestCase": "[\"MyCircularQueue\",\"enQueue\",\"enQueue\",\"enQueue\",\"enQueue\",\"Rear\",\"isFull\",\"deQueue\",\"enQueue\",\"Rear\"]\n[[3],[1],[2],[3],[4],[],[],[],[4],[]]", "metaData": "{\n \"classname\": \"MyCircularQueue\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"k\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"value\"\n }\n ],\n \"name\": \"enQueue\",\n \"return\": {\n \"type\": \"boolean\"\n }\n },\n {\n \"params\": [],\n \"name\": \"deQueue\",\n \"return\": {\n \"type\": \"boolean\"\n }\n },\n {\n \"params\": [],\n \"name\": \"Front\",\n \"return\": {\n \"type\": \"integer\"\n }\n 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