mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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183 lines
28 KiB
JSON
183 lines
28 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "100169",
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"questionFrontendId": "面试题 03.02",
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"categoryTitle": "LCCI",
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"boundTopicId": 45973,
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"title": "Min Stack LCCI",
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"titleSlug": "min-stack-lcci",
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"content": "<p>How would you design a stack which, in addition to push and pop, has a function min which returns the minimum element? Push, pop and min should all operate in 0(1) time.</p>\r\n\r\n<p><strong>Example: </strong></p>\r\n\r\n<pre>\r\nMinStack minStack = new MinStack();\r\nminStack.push(-2);\r\nminStack.push(0);\r\nminStack.push(-3);\r\nminStack.getMin(); --> return -3.\r\nminStack.pop();\r\nminStack.top(); --> return 0.\r\nminStack.getMin(); --> return -2.</pre>\r\n",
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"translatedTitle": "栈的最小值",
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"translatedContent": "<p>请设计一个栈，除了常规栈支持的pop与push函数以外，还支持min函数，该函数返回栈元素中的最小值。执行push、pop和min操作的时间复杂度必须为O(1)。</p><br><p><strong>示例：</strong><pre>MinStack minStack = new MinStack();<br>minStack.push(-2);<br>minStack.push(0);<br>minStack.push(-3);<br>minStack.getMin(); --> 返回 -3.<br>minStack.pop();<br>minStack.top(); --> 返回 0.<br>minStack.getMin(); --> 返回 -2.</pre></p>",
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"difficulty": "Easy",
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"name": "Stack",
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"translatedName": "栈",
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"lang": "C++",
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"code": "class MinStack {\npublic:\n /** initialize your data structure here. */\n MinStack() {\n\n }\n \n void push(int x) {\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(x);\n * obj->pop();\n * int param_3 = obj->top();\n * int param_4 = obj->getMin();\n */",
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"lang": "Java",
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"code": "class MinStack {\n\n /** initialize your data structure here. */\n public MinStack() {\n\n }\n \n public void push(int x) {\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(x);\n * obj.pop();\n * int param_3 = obj.top();\n * int param_4 = obj.getMin();\n */",
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"code": "class MinStack(object):\n\n def __init__(self):\n \"\"\"\n initialize your data structure here.\n \"\"\"\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: 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(x)\n# obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.getMin()",
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"lang": "Python3",
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"code": "class MinStack:\n\n def __init__(self):\n \"\"\"\n initialize your data structure here.\n \"\"\"\n\n\n def push(self, x: 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(x)\n# obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.getMin()",
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"lang": "C",
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"code": "\n\n\ntypedef struct {\n\n} MinStack;\n\n/** initialize your data structure here. */\n\nMinStack* minStackCreate() {\n\n}\n\nvoid minStackPush(MinStack* obj, int x) {\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, x);\n \n * minStackPop(obj);\n \n * int param_3 = minStackTop(obj);\n \n * int param_4 = minStackGetMin(obj);\n \n * minStackFree(obj);\n*/",
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"code": "public class MinStack {\n\n /** initialize your data structure here. */\n public MinStack() {\n\n }\n \n public void Push(int x) {\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(x);\n * obj.Pop();\n * int param_3 = obj.Top();\n * int param_4 = obj.GetMin();\n */",
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"lang": "JavaScript",
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"code": "/**\n * initialize your data structure here.\n */\nvar MinStack = function() {\n\n};\n\n/** \n * @param {number} x\n * @return {void}\n */\nMinStack.prototype.push = function(x) {\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(x)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "class MinStack\n\n=begin\n initialize your data structure here.\n=end\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: 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(x)\n# obj.pop()\n# param_3 = obj.top()\n# param_4 = obj.get_min()",
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"__typename": "CodeSnippetNode"
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"lang": "Swift",
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"langSlug": "swift",
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"code": "\nclass MinStack {\n\n /** initialize your data structure here. */\n init() {\n\n }\n \n func push(_ x: 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(x)\n * obj.pop()\n * let ret_3: Int = obj.top()\n * let ret_4: Int = obj.getMin()\n */",
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"__typename": "CodeSnippetNode"
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"lang": "Go",
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"langSlug": "golang",
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"code": "type MinStack struct {\n\n}\n\n\n/** initialize your data structure here. */\nfunc Constructor() MinStack {\n\n}\n\n\nfunc (this *MinStack) Push(x 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(x);\n * obj.Pop();\n * param_3 := obj.Top();\n * param_4 := obj.GetMin();\n */",
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"lang": "Scala",
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"code": "class MinStack() {\n\n /** initialize your data structure here. */\n\n\n def push(x: 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(x)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class MinStack() {\n\n /** initialize your data structure here. */\n\n\n fun push(x: 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(x)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
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"lang": "Rust",
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"langSlug": "rust",
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"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 /** initialize your data structure here. */\n fn new() -> Self {\n\n }\n \n fn push(&self, x: 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(x);\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",
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"langSlug": "php",
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"code": "class MinStack {\n /**\n * initialize your data structure here.\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 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 * $obj->push($x);\n * $obj->pop();\n * $ret_3 = $obj->top();\n * $ret_4 = $obj->getMin();\n */",
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"code": "class MinStack {\n constructor() {\n\n }\n\n push(x: 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(x)\n * obj.pop()\n * var param_3 = obj.top()\n * var param_4 = obj.getMin()\n */",
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define min-stack%\n (class object%\n (super-new)\n (init-field)\n \n ; push : exact-integer? -> void?\n (define/public (push x)\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 x)\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",
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"code": "-spec min_stack_init_() -> any().\nmin_stack_init_() ->\n .\n\n-spec min_stack_push(X :: integer()) -> any().\nmin_stack_push(X) ->\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(X),\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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"langSlug": "elixir",
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"code": "defmodule MinStack 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() :: 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(x)\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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"hints": [
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"注意最小的元素不会经常变化。它只在添加更小的元素或最小的元素被弹出时才发生变化。",
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"如果保持追踪每个栈节点的额外数据会怎么样？什么样的数据可能更容易解决这个问题呢？",
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"考虑让每个节点知道它“子栈”的最小值（包括它下面的所有元素，以及它本身）。"
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"sampleTestCase": "[\"MinStack\",\"push\",\"push\",\"push\",\"getMin\",\"pop\",\"top\",\"getMin\"]\n[[],[-2],[0],[-3],[],[],[],[]]",
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