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            "title": "Min Stack",
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            "content": "<p>Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.</p>\n\n<p>Implement the <code>MinStack</code> class:</p>\n\n<ul>\n\t<li><code>MinStack()</code> initializes the stack object.</li>\n\t<li><code>void push(int val)</code> pushes the element <code>val</code> onto the stack.</li>\n\t<li><code>void pop()</code> removes the element on the top of the stack.</li>\n\t<li><code>int top()</code> gets the top element of the stack.</li>\n\t<li><code>int getMin()</code> retrieves the minimum element in the stack.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n[&quot;MinStack&quot;,&quot;push&quot;,&quot;push&quot;,&quot;push&quot;,&quot;getMin&quot;,&quot;pop&quot;,&quot;top&quot;,&quot;getMin&quot;]\n[[],[-2],[0],[-3],[],[],[],[]]\n\n<strong>Output</strong>\n[null,null,null,null,-3,null,0,-2]\n\n<strong>Explanation</strong>\nMinStack minStack = new MinStack();\nminStack.push(-2);\nminStack.push(0);\nminStack.push(-3);\nminStack.getMin(); // return -3\nminStack.pop();\nminStack.top();    // return 0\nminStack.getMin(); // return -2\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>-2<sup>31</sup> &lt;= val &lt;= 2<sup>31</sup> - 1</code></li>\n\t<li>Methods <code>pop</code>, <code>top</code> and <code>getMin</code> operations will always be called on <strong>non-empty</strong> stacks.</li>\n\t<li>At most <code>3 * 10<sup>4</sup></code> calls will be made to <code>push</code>, <code>pop</code>, <code>top</code>, and <code>getMin</code>.</li>\n</ul>\n",
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            "exampleTestcases": "[\"MinStack\",\"push\",\"push\",\"push\",\"getMin\",\"pop\",\"top\",\"getMin\"]\n[[],[-2],[0],[-3],[],[],[],[]]",
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                {
                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class MinStack {\npublic:\n    MinStack() {\n        \n    }\n    \n    void push(int val) {\n        \n    }\n    \n    void pop() {\n        \n    }\n    \n    int top() {\n        \n    }\n    \n    int getMin() {\n        \n    }\n};\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * MinStack* obj = new MinStack();\n * obj->push(val);\n * obj->pop();\n * int param_3 = obj->top();\n * int param_4 = obj->getMin();\n */",
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                    "lang": "Java",
                    "langSlug": "java",
                    "code": "class MinStack {\n\n    public MinStack() {\n        \n    }\n    \n    public void push(int val) {\n        \n    }\n    \n    public void pop() {\n        \n    }\n    \n    public int top() {\n        \n    }\n    \n    public int getMin() {\n        \n    }\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * MinStack obj = new MinStack();\n * obj.push(val);\n * obj.pop();\n * int param_3 = obj.top();\n * int param_4 = obj.getMin();\n */",
                    "__typename": "CodeSnippetNode"
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                    "lang": "Python",
                    "langSlug": "python",
                    "code": "class MinStack(object):\n\n    def __init__(self):\n        \n\n    def push(self, val):\n        \"\"\"\n        :type val: int\n        :rtype: None\n        \"\"\"\n        \n\n    def pop(self):\n        \"\"\"\n        :rtype: None\n        \"\"\"\n        \n\n    def top(self):\n        \"\"\"\n        :rtype: int\n        \"\"\"\n        \n\n    def getMin(self):\n        \"\"\"\n        :rtype: int\n        \"\"\"\n        \n\n\n# Your MinStack object will be instantiated and called as such:\n# obj = MinStack()\n# obj.push(val)\n# obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.getMin()",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Python3",
                    "langSlug": "python3",
                    "code": "class MinStack:\n\n    def __init__(self):\n        \n\n    def push(self, val: int) -> None:\n        \n\n    def pop(self) -> None:\n        \n\n    def top(self) -> int:\n        \n\n    def getMin(self) -> int:\n        \n\n\n# Your MinStack object will be instantiated and called as such:\n# obj = MinStack()\n# obj.push(val)\n# obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.getMin()",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C",
                    "langSlug": "c",
                    "code": "\n\n\ntypedef struct {\n    \n} MinStack;\n\n\nMinStack* minStackCreate() {\n    \n}\n\nvoid minStackPush(MinStack* obj, int val) {\n  \n}\n\nvoid minStackPop(MinStack* obj) {\n  \n}\n\nint minStackTop(MinStack* obj) {\n  \n}\n\nint minStackGetMin(MinStack* obj) {\n  \n}\n\nvoid minStackFree(MinStack* obj) {\n    \n}\n\n/**\n * Your MinStack struct will be instantiated and called as such:\n * MinStack* obj = minStackCreate();\n * minStackPush(obj, val);\n \n * minStackPop(obj);\n \n * int param_3 = minStackTop(obj);\n \n * int param_4 = minStackGetMin(obj);\n \n * minStackFree(obj);\n*/",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "C#",
                    "langSlug": "csharp",
                    "code": "public class MinStack {\n\n    public MinStack() {\n        \n    }\n    \n    public void Push(int val) {\n        \n    }\n    \n    public void Pop() {\n        \n    }\n    \n    public int Top() {\n        \n    }\n    \n    public int GetMin() {\n        \n    }\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * MinStack obj = new MinStack();\n * obj.Push(val);\n * obj.Pop();\n * int param_3 = obj.Top();\n * int param_4 = obj.GetMin();\n */",
                    "__typename": "CodeSnippetNode"
                },
                {
                    "lang": "JavaScript",
                    "langSlug": "javascript",
                    "code": "\nvar MinStack = function() {\n    \n};\n\n/** \n * @param {number} val\n * @return {void}\n */\nMinStack.prototype.push = function(val) {\n    \n};\n\n/**\n * @return {void}\n */\nMinStack.prototype.pop = function() {\n    \n};\n\n/**\n * @return {number}\n */\nMinStack.prototype.top = function() {\n    \n};\n\n/**\n * @return {number}\n */\nMinStack.prototype.getMin = function() {\n    \n};\n\n/** \n * Your MinStack object will be instantiated and called as such:\n * var obj = new MinStack()\n * obj.push(val)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Ruby",
                    "langSlug": "ruby",
                    "code": "class MinStack\n    def initialize()\n        \n    end\n\n\n=begin\n    :type val: Integer\n    :rtype: Void\n=end\n    def push(val)\n        \n    end\n\n\n=begin\n    :rtype: Void\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: Integer\n=end\n    def get_min()\n        \n    end\n\n\nend\n\n# Your MinStack object will be instantiated and called as such:\n# obj = MinStack.new()\n# obj.push(val)\n# obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.get_min()",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Swift",
                    "langSlug": "swift",
                    "code": "\nclass MinStack {\n\n    init() {\n        \n    }\n    \n    func push(_ val: Int) {\n        \n    }\n    \n    func pop() {\n        \n    }\n    \n    func top() -> Int {\n        \n    }\n    \n    func getMin() -> Int {\n        \n    }\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * let obj = MinStack()\n * obj.push(val)\n * obj.pop()\n * let ret_3: Int = obj.top()\n * let ret_4: Int = obj.getMin()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Go",
                    "langSlug": "golang",
                    "code": "type MinStack struct {\n    \n}\n\n\nfunc Constructor() MinStack {\n    \n}\n\n\nfunc (this *MinStack) Push(val int)  {\n    \n}\n\n\nfunc (this *MinStack) Pop()  {\n    \n}\n\n\nfunc (this *MinStack) Top() int {\n    \n}\n\n\nfunc (this *MinStack) GetMin() int {\n    \n}\n\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * obj := Constructor();\n * obj.Push(val);\n * obj.Pop();\n * param_3 := obj.Top();\n * param_4 := obj.GetMin();\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Scala",
                    "langSlug": "scala",
                    "code": "class MinStack() {\n\n    def push(`val`: Int) {\n        \n    }\n\n    def pop() {\n        \n    }\n\n    def top(): Int = {\n        \n    }\n\n    def getMin(): Int = {\n        \n    }\n\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * var obj = new MinStack()\n * obj.push(`val`)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Kotlin",
                    "langSlug": "kotlin",
                    "code": "class MinStack() {\n\n    fun push(`val`: Int) {\n        \n    }\n\n    fun pop() {\n        \n    }\n\n    fun top(): Int {\n        \n    }\n\n    fun getMin(): Int {\n        \n    }\n\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * var obj = MinStack()\n * obj.push(`val`)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "Rust",
                    "langSlug": "rust",
                    "code": "struct MinStack {\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 MinStack {\n\n    fn new() -> Self {\n        \n    }\n    \n    fn push(&self, val: i32) {\n        \n    }\n    \n    fn pop(&self) {\n        \n    }\n    \n    fn top(&self) -> i32 {\n        \n    }\n    \n    fn get_min(&self) -> i32 {\n        \n    }\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * let obj = MinStack::new();\n * obj.push(val);\n * obj.pop();\n * let ret_3: i32 = obj.top();\n * let ret_4: i32 = obj.get_min();\n */",
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                {
                    "lang": "PHP",
                    "langSlug": "php",
                    "code": "class MinStack {\n    /**\n     */\n    function __construct() {\n        \n    }\n  \n    /**\n     * @param Integer $val\n     * @return NULL\n     */\n    function push($val) {\n        \n    }\n  \n    /**\n     * @return NULL\n     */\n    function pop() {\n        \n    }\n  \n    /**\n     * @return Integer\n     */\n    function top() {\n        \n    }\n  \n    /**\n     * @return Integer\n     */\n    function getMin() {\n        \n    }\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * $obj = MinStack();\n * $obj->push($val);\n * $obj->pop();\n * $ret_3 = $obj->top();\n * $ret_4 = $obj->getMin();\n */",
                    "__typename": "CodeSnippetNode"
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                {
                    "lang": "TypeScript",
                    "langSlug": "typescript",
                    "code": "class MinStack {\n    constructor() {\n\n    }\n\n    push(val: number): void {\n\n    }\n\n    pop(): void {\n\n    }\n\n    top(): number {\n\n    }\n\n    getMin(): number {\n\n    }\n}\n\n/**\n * Your MinStack object will be instantiated and called as such:\n * var obj = new MinStack()\n * obj.push(val)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
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                {
                    "lang": "Racket",
                    "langSlug": "racket",
                    "code": "(define min-stack%\n  (class object%\n    (super-new)\n    \n    (init-field)\n    \n    ; push : exact-integer? -> void?\n    (define/public (push val)\n\n      )\n    ; pop : -> void?\n    (define/public (pop)\n\n      )\n    ; top : -> exact-integer?\n    (define/public (top)\n\n      )\n    ; get-min : -> exact-integer?\n    (define/public (get-min)\n\n      )))\n\n;; Your min-stack% object will be instantiated and called as such:\n;; (define obj (new min-stack%))\n;; (send obj push val)\n;; (send obj pop)\n;; (define param_3 (send obj top))\n;; (define param_4 (send obj get-min))",
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                    "lang": "Erlang",
                    "langSlug": "erlang",
                    "code": "-spec min_stack_init_() -> any().\nmin_stack_init_() ->\n  .\n\n-spec min_stack_push(Val :: integer()) -> any().\nmin_stack_push(Val) ->\n  .\n\n-spec min_stack_pop() -> any().\nmin_stack_pop() ->\n  .\n\n-spec min_stack_top() -> integer().\nmin_stack_top() ->\n  .\n\n-spec min_stack_get_min() -> integer().\nmin_stack_get_min() ->\n  .\n\n\n%% Your functions will be called as such:\n%% min_stack_init_(),\n%% min_stack_push(Val),\n%% min_stack_pop(),\n%% Param_3 = min_stack_top(),\n%% Param_4 = min_stack_get_min(),\n\n%% min_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 MinStack do\n  @spec init_() :: any\n  def init_() do\n\n  end\n\n  @spec push(val :: integer) :: any\n  def push(val) do\n\n  end\n\n  @spec pop() :: any\n  def pop() do\n\n  end\n\n  @spec top() :: integer\n  def top() do\n\n  end\n\n  @spec get_min() :: integer\n  def get_min() do\n\n  end\nend\n\n# Your functions will be called as such:\n# MinStack.init_()\n# MinStack.push(val)\n# MinStack.pop()\n# param_3 = MinStack.top()\n# param_4 = MinStack.get_min()\n\n# MinStack.init_ will be called before every test case, in which you can do some necessary initializations.",
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                "Consider each node in the stack having a minimum value. (Credits to @aakarshmadhavan)"
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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 gnu99 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://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\\r\\n\\r\\n<p>Your code is compiled with debug flag enabled (<code>/debug</code>).</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 <a href=\\\"https://github.com/datastructures-js/priority-queue\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and <a href=\\\"https://github.com/datastructures-js/queue\\\" 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 1.17.6</code>.</p>\\r\\n\\r\\n<p>Support <a href=\\\"https://godoc.org/github.com/emirpasic/gods\\\" target=\\\"_blank\\\">https://godoc.org/github.com/emirpasic/gods</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 1.3.10</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 4.5.4, 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 ES2020 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 24.2\"], \"elixir\": [\"Elixir\", \"Elixir 1.13.0 with Erlang/OTP 24.2\"]}",
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