{
"data": {
"question": {
"questionId": "155",
"questionFrontendId": "155",
"boundTopicId": null,
"title": "Min Stack",
"titleSlug": "min-stack",
"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> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\n["MinStack","push","push","push","getMin","pop","top","getMin"]\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> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>-2<sup>31</sup> <= val <= 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",
"translatedTitle": null,
"translatedContent": null,
"isPaidOnly": false,
"difficulty": "Easy",
"likes": 7631,
"dislikes": 601,
"isLiked": null,
"similarQuestions": "[{\"title\": \"Sliding Window Maximum\", \"titleSlug\": \"sliding-window-maximum\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Max Stack\", \"titleSlug\": \"max-stack\", \"difficulty\": \"Easy\", \"translatedTitle\": null}]",
"exampleTestcases": "[\"MinStack\",\"push\",\"push\",\"push\",\"getMin\",\"pop\",\"top\",\"getMin\"]\n[[],[-2],[0],[-3],[],[],[],[]]",
"categoryTitle": "Algorithms",
"contributors": [],
"topicTags": [
{
"name": "Stack",
"slug": "stack",
"translatedName": null,
"__typename": "TopicTagNode"
},
{
"name": "Design",
"slug": "design",
"translatedName": null,
"__typename": "TopicTagNode"
}
],
"companyTagStats": null,
"codeSnippets": [
{
"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 */",
"__typename": "CodeSnippetNode"
},
{
"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"
},
{
"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"
},
{
"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"
},
{
"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"
},
{
"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"
},
{
"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"
},
{
"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"
},
{
"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"
},
{
"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 */",
"__typename": "CodeSnippetNode"
},
{
"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"
},
{
"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 */",
"__typename": "CodeSnippetNode"
},
{
"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))",
"__typename": "CodeSnippetNode"
},
{
"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.",
"__typename": "CodeSnippetNode"
},
{
"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.",
"__typename": "CodeSnippetNode"
}
],
"stats": "{\"totalAccepted\": \"937.7K\", \"totalSubmission\": \"1.9M\", \"totalAcceptedRaw\": 937703, \"totalSubmissionRaw\": 1879861, \"acRate\": \"49.9%\"}",
"hints": [
"Consider each node in the stack having a minimum value. (Credits to @aakarshmadhavan)"
],
"solution": {
"id": "876",
"canSeeDetail": false,
"paidOnly": true,
"hasVideoSolution": false,
"paidOnlyVideo": true,
"__typename": "ArticleNode"
},
"status": null,
"sampleTestCase": "[\"MinStack\",\"push\",\"push\",\"push\",\"getMin\",\"pop\",\"top\",\"getMin\"]\n[[],[-2],[0],[-3],[],[],[],[]]",
"metaData": "{\n \"classname\": \"MinStack\",\n \"constructor\": {\n \"params\": []\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"val\"\n }\n ],\n \"return\": {\n \"type\": \"void\"\n },\n \"name\": \"push\"\n },\n {\n \"params\": [],\n \"return\": {\n \"type\": \"void\"\n },\n \"name\": \"pop\"\n },\n {\n \"params\": [],\n \"return\": {\n \"type\": \"integer\"\n },\n \"name\": \"top\"\n },\n {\n \"params\": [],\n \"return\": {\n \"type\": \"integer\"\n },\n \"name\": \"getMin\"\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}",
"judgerAvailable": true,
"judgeType": "large",
"mysqlSchemas": [],
"enableRunCode": true,
"enableTestMode": false,
"enableDebugger": true,
"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</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 17 </code>. 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\"]}",
"libraryUrl": null,
"adminUrl": null,
"challengeQuestion": null,
"__typename": "QuestionNode"
}
}
}