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            "title": "Implement Stack using Queues",
            "titleSlug": "implement-stack-using-queues",
            "content": "<p>Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (<code>push</code>, <code>top</code>, <code>pop</code>, and <code>empty</code>).</p>\n\n<p>Implement the <code>MyStack</code> class:</p>\n\n<ul>\n\t<li><code>void push(int x)</code> Pushes element x to the top of the stack.</li>\n\t<li><code>int pop()</code> Removes the element on the top of the stack and returns it.</li>\n\t<li><code>int top()</code> Returns the element on the top of the stack.</li>\n\t<li><code>boolean empty()</code> Returns <code>true</code> if the stack is empty, <code>false</code> otherwise.</li>\n</ul>\n\n<p><b>Notes:</b></p>\n\n<ul>\n\t<li>You must use <strong>only</strong> standard operations of a queue, which means that only <code>push to back</code>, <code>peek/pop from front</code>, <code>size</code> and <code>is empty</code> operations are valid.</li>\n\t<li>Depending on your language, the queue may not be supported natively. You may simulate a queue using a list or deque (double-ended queue) as long as you use only a queue&#39;s standard operations.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;MyStack&quot;, &quot;push&quot;, &quot;push&quot;, &quot;top&quot;, &quot;pop&quot;, &quot;empty&quot;]\n[[], [1], [2], [], [], []]\n<strong>Output</strong>\n[null, null, null, 2, 2, false]\n\n<strong>Explanation</strong>\nMyStack myStack = new MyStack();\nmyStack.push(1);\nmyStack.push(2);\nmyStack.top(); // return 2\nmyStack.pop(); // return 2\nmyStack.empty(); // return False\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= x &lt;= 9</code></li>\n\t<li>At most <code>100</code> calls will be made to <code>push</code>, <code>pop</code>, <code>top</code>, and <code>empty</code>.</li>\n\t<li>All the calls to <code>pop</code> and <code>top</code> are valid.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Follow-up:</strong> Can you implement the stack using only one queue?</p>\n",
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                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class MyStack {\npublic:\n    MyStack() {\n        \n    }\n    \n    void push(int x) {\n        \n    }\n    \n    int pop() {\n        \n    }\n    \n    int top() {\n        \n    }\n    \n    bool empty() {\n        \n    }\n};\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * MyStack* obj = new MyStack();\n * obj->push(x);\n * int param_2 = obj->pop();\n * int param_3 = obj->top();\n * bool param_4 = obj->empty();\n */",
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                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class MyStack {\n\n    public MyStack() {\n        \n    }\n    \n    public void push(int x) {\n        \n    }\n    \n    public int pop() {\n        \n    }\n    \n    public int top() {\n        \n    }\n    \n    public boolean empty() {\n        \n    }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * MyStack obj = new MyStack();\n * obj.push(x);\n * int param_2 = obj.pop();\n * int param_3 = obj.top();\n * boolean param_4 = obj.empty();\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class MyStack(object):\n\n    def __init__(self):\n        \n\n    def push(self, x):\n        \"\"\"\n        :type x: int\n        :rtype: None\n        \"\"\"\n        \n\n    def pop(self):\n        \"\"\"\n        :rtype: int\n        \"\"\"\n        \n\n    def top(self):\n        \"\"\"\n        :rtype: int\n        \"\"\"\n        \n\n    def empty(self):\n        \"\"\"\n        :rtype: bool\n        \"\"\"\n        \n\n\n# Your MyStack object will be instantiated and called as such:\n# obj = MyStack()\n# obj.push(x)\n# param_2 = obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.empty()",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class MyStack:\n\n    def __init__(self):\n        \n\n    def push(self, x: int) -> None:\n        \n\n    def pop(self) -> int:\n        \n\n    def top(self) -> int:\n        \n\n    def empty(self) -> bool:\n        \n\n\n# Your MyStack object will be instantiated and called as such:\n# obj = MyStack()\n# obj.push(x)\n# param_2 = obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.empty()",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} MyStack;\n\n\nMyStack* myStackCreate() {\n    \n}\n\nvoid myStackPush(MyStack* obj, int x) {\n    \n}\n\nint myStackPop(MyStack* obj) {\n    \n}\n\nint myStackTop(MyStack* obj) {\n    \n}\n\nbool myStackEmpty(MyStack* obj) {\n    \n}\n\nvoid myStackFree(MyStack* obj) {\n    \n}\n\n/**\n * Your MyStack struct will be instantiated and called as such:\n * MyStack* obj = myStackCreate();\n * myStackPush(obj, x);\n \n * int param_2 = myStackPop(obj);\n \n * int param_3 = myStackTop(obj);\n \n * bool param_4 = myStackEmpty(obj);\n \n * myStackFree(obj);\n*/",
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                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class MyStack {\n\n    public MyStack() {\n        \n    }\n    \n    public void Push(int x) {\n        \n    }\n    \n    public int Pop() {\n        \n    }\n    \n    public int Top() {\n        \n    }\n    \n    public bool Empty() {\n        \n    }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * MyStack obj = new MyStack();\n * obj.Push(x);\n * int param_2 = obj.Pop();\n * int param_3 = obj.Top();\n * bool param_4 = obj.Empty();\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar MyStack = function() {\n    \n};\n\n/** \n * @param {number} x\n * @return {void}\n */\nMyStack.prototype.push = function(x) {\n    \n};\n\n/**\n * @return {number}\n */\nMyStack.prototype.pop = function() {\n    \n};\n\n/**\n * @return {number}\n */\nMyStack.prototype.top = function() {\n    \n};\n\n/**\n * @return {boolean}\n */\nMyStack.prototype.empty = function() {\n    \n};\n\n/** \n * Your MyStack object will be instantiated and called as such:\n * var obj = new MyStack()\n * obj.push(x)\n * var param_2 = obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.empty()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class MyStack {\n    constructor() {\n        \n    }\n\n    push(x: number): void {\n        \n    }\n\n    pop(): number {\n        \n    }\n\n    top(): number {\n        \n    }\n\n    empty(): boolean {\n        \n    }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * var obj = new MyStack()\n * obj.push(x)\n * var param_2 = obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.empty()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class MyStack {\n    /**\n     */\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param Integer $x\n     * @return NULL\n     */\n    function push($x) {\n        \n    }\n  \n    /**\n     * @return Integer\n     */\n    function pop() {\n        \n    }\n  \n    /**\n     * @return Integer\n     */\n    function top() {\n        \n    }\n  \n    /**\n     * @return Boolean\n     */\n    function empty() {\n        \n    }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * $obj = MyStack();\n * $obj->push($x);\n * $ret_2 = $obj->pop();\n * $ret_3 = $obj->top();\n * $ret_4 = $obj->empty();\n */",
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                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass MyStack {\n\n    init() {\n        \n    }\n    \n    func push(_ x: Int) {\n        \n    }\n    \n    func pop() -> Int {\n        \n    }\n    \n    func top() -> Int {\n        \n    }\n    \n    func empty() -> Bool {\n        \n    }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * let obj = MyStack()\n * obj.push(x)\n * let ret_2: Int = obj.pop()\n * let ret_3: Int = obj.top()\n * let ret_4: Bool = obj.empty()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class MyStack() {\n\n    fun push(x: Int) {\n        \n    }\n\n    fun pop(): Int {\n        \n    }\n\n    fun top(): Int {\n        \n    }\n\n    fun empty(): Boolean {\n        \n    }\n\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * var obj = MyStack()\n * obj.push(x)\n * var param_2 = obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.empty()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Dart",
                    "langSlug": "dart",
                    "code": "class MyStack {\n\n  MyStack() {\n    \n  }\n  \n  void push(int x) {\n    \n  }\n  \n  int pop() {\n    \n  }\n  \n  int top() {\n    \n  }\n  \n  bool empty() {\n    \n  }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * MyStack obj = MyStack();\n * obj.push(x);\n * int param2 = obj.pop();\n * int param3 = obj.top();\n * bool param4 = obj.empty();\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type MyStack struct {\n    \n}\n\n\nfunc Constructor() MyStack {\n    \n}\n\n\nfunc (this *MyStack) Push(x int)  {\n    \n}\n\n\nfunc (this *MyStack) Pop() int {\n    \n}\n\n\nfunc (this *MyStack) Top() int {\n    \n}\n\n\nfunc (this *MyStack) Empty() bool {\n    \n}\n\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Push(x);\n * param_2 := obj.Pop();\n * param_3 := obj.Top();\n * param_4 := obj.Empty();\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class MyStack\n    def initialize()\n        \n    end\n\n\n=begin\n    :type x: Integer\n    :rtype: Void\n=end\n    def push(x)\n        \n    end\n\n\n=begin\n    :rtype: Integer\n=end\n    def pop()\n        \n    end\n\n\n=begin\n    :rtype: Integer\n=end\n    def top()\n        \n    end\n\n\n=begin\n    :rtype: Boolean\n=end\n    def empty()\n        \n    end\n\n\nend\n\n# Your MyStack object will be instantiated and called as such:\n# obj = MyStack.new()\n# obj.push(x)\n# param_2 = obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.empty()",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class MyStack() {\n\n    def push(x: Int) {\n        \n    }\n\n    def pop(): Int = {\n        \n    }\n\n    def top(): Int = {\n        \n    }\n\n    def empty(): Boolean = {\n        \n    }\n\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * var obj = new MyStack()\n * obj.push(x)\n * var param_2 = obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.empty()\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct MyStack {\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 MyStack {\n\n    fn new() -> Self {\n        \n    }\n    \n    fn push(&self, x: i32) {\n        \n    }\n    \n    fn pop(&self) -> i32 {\n        \n    }\n    \n    fn top(&self) -> i32 {\n        \n    }\n    \n    fn empty(&self) -> bool {\n        \n    }\n}\n\n/**\n * Your MyStack object will be instantiated and called as such:\n * let obj = MyStack::new();\n * obj.push(x);\n * let ret_2: i32 = obj.pop();\n * let ret_3: i32 = obj.top();\n * let ret_4: bool = obj.empty();\n */",
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                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define my-stack%\n  (class object%\n    (super-new)\n    \n    (init-field)\n    \n    ; push : exact-integer? -> void?\n    (define/public (push x)\n      )\n    ; pop : -> exact-integer?\n    (define/public (pop)\n      )\n    ; top : -> exact-integer?\n    (define/public (top)\n      )\n    ; empty : -> boolean?\n    (define/public (empty)\n      )))\n\n;; Your my-stack% object will be instantiated and called as such:\n;; (define obj (new my-stack%))\n;; (send obj push x)\n;; (define param_2 (send obj pop))\n;; (define param_3 (send obj top))\n;; (define param_4 (send obj empty))",
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                    "lang": "Erlang",
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                    "code": "-spec my_stack_init_() -> any().\nmy_stack_init_() ->\n  .\n\n-spec my_stack_push(X :: integer()) -> any().\nmy_stack_push(X) ->\n  .\n\n-spec my_stack_pop() -> integer().\nmy_stack_pop() ->\n  .\n\n-spec my_stack_top() -> integer().\nmy_stack_top() ->\n  .\n\n-spec my_stack_empty() -> boolean().\nmy_stack_empty() ->\n  .\n\n\n%% Your functions will be called as such:\n%% my_stack_init_(),\n%% my_stack_push(X),\n%% Param_2 = my_stack_pop(),\n%% Param_3 = my_stack_top(),\n%% Param_4 = my_stack_empty(),\n\n%% my_stack_init_ will be called before every test case, in which you can do some necessary initializations.",
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                    "lang": "Elixir",
                    "langSlug": "elixir",
                    "code": "defmodule MyStack do\n  @spec init_() :: any\n  def init_() do\n    \n  end\n\n  @spec push(x :: integer) :: any\n  def push(x) do\n    \n  end\n\n  @spec pop() :: integer\n  def pop() do\n    \n  end\n\n  @spec top() :: integer\n  def top() do\n    \n  end\n\n  @spec empty() :: boolean\n  def empty() do\n    \n  end\nend\n\n# Your functions will be called as such:\n# MyStack.init_()\n# MyStack.push(x)\n# param_2 = MyStack.pop()\n# param_3 = MyStack.top()\n# param_4 = MyStack.empty()\n\n# MyStack.init_ will be called before every test case, in which you can do some necessary initializations.",
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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 gnu11 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://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></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 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://github.com/datastructures-js/queue/tree/e63563025a5a805aa16928cb53bcd517bfea9230\\\" 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 1.21</code></p>\\r\\n<p>Support <a href=\\\"https://github.com/emirpasic/gods/tree/v1.18.1\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods@v1.18.1</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 1.9.0</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 5.1.6, 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 ES2022 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 25.0\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.4 with Erlang/OTP 25.0\"], \"dart\": [\"Dart\", \"<p>Dart 2.17.3</p>\\r\\n\\r\\n<p>Your code will be run directly without compiling</p>\"]}",
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            "challengeQuestion": {
                "id": "1458",
                "date": "2023-08-28",
                "incompleteChallengeCount": 0,
                "streakCount": 0,
                "type": "DAILY",
                "__typename": "ChallengeQuestionNode"
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