{ "data": { "question": { "questionId": "1270", "questionFrontendId": "1172", "categoryTitle": "Algorithms", "boundTopicId": 22199, "title": "Dinner Plate Stacks", "titleSlug": "dinner-plate-stacks", "content": "

You have an infinite number of stacks arranged in a row and numbered (left to right) from 0, each of the stacks has the same maximum capacity.

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Implement the DinnerPlates class:

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Example 1:

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\nInput\n["DinnerPlates", "push", "push", "push", "push", "push", "popAtStack", "push", "push", "popAtStack", "popAtStack", "pop", "pop", "pop", "pop", "pop"]\n[[2], [1], [2], [3], [4], [5], [0], [20], [21], [0], [2], [], [], [], [], []]\nOutput\n[null, null, null, null, null, null, 2, null, null, 20, 21, 5, 4, 3, 1, -1]\n\nExplanation: \nDinnerPlates D = DinnerPlates(2);  // Initialize with capacity = 2\nD.push(1);\nD.push(2);\nD.push(3);\nD.push(4);\nD.push(5);         // The stacks are now:  2  4\n                                           1  3  5\n                                           ﹈ ﹈ ﹈\nD.popAtStack(0);   // Returns 2.  The stacks are now:     4\n                                                       1  3  5\n                                                       ﹈ ﹈ ﹈\nD.push(20);        // The stacks are now: 20  4\n                                           1  3  5\n                                           ﹈ ﹈ ﹈\nD.push(21);        // The stacks are now: 20  4 21\n                                           1  3  5\n                                           ﹈ ﹈ ﹈\nD.popAtStack(0);   // Returns 20.  The stacks are now:     4 21\n                                                        1  3  5\n                                                        ﹈ ﹈ ﹈\nD.popAtStack(2);   // Returns 21.  The stacks are now:     4\n                                                        1  3  5\n                                                        ﹈ ﹈ ﹈ \nD.pop()            // Returns 5.  The stacks are now:      4\n                                                        1  3 \n                                                        ﹈ ﹈  \nD.pop()            // Returns 4.  The stacks are now:   1  3 \n                                                        ﹈ ﹈   \nD.pop()            // Returns 3.  The stacks are now:   1 \n                                                        ﹈   \nD.pop()            // Returns 1.  There are no stacks.\nD.pop()            // Returns -1.  There are still no stacks.\n
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Constraints:

\n\n\n", "translatedTitle": "餐盘栈", "translatedContent": "

我们把无限数量 ∞ 的栈排成一行，按从左到右的次序从 0 开始编号。每个栈的的最大容量 capacity 都相同。

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实现一个叫「餐盘」的类 DinnerPlates：

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示例：

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输入： \n["DinnerPlates","push","push","push","push","push","popAtStack","push","push","popAtStack","popAtStack","pop","pop","pop","pop","pop"]\n[[2],[1],[2],[3],[4],[5],[0],[20],[21],[0],[2],[],[],[],[],[]]\n输出：\n[null,null,null,null,null,null,2,null,null,20,21,5,4,3,1,-1]\n\n解释：\nDinnerPlates D = DinnerPlates(2);  // 初始化，栈最大容量 capacity = 2\nD.push(1);\nD.push(2);\nD.push(3);\nD.push(4);\nD.push(5);         // 栈的现状为：    2  4\n                                    1  3  5\n                                    ﹈ ﹈ ﹈\nD.popAtStack(0);   // 返回 2。栈的现状为：      4\n                                          1  3  5\n                                          ﹈ ﹈ ﹈\nD.push(20);        // 栈的现状为：  20  4\n                                   1  3  5\n                                   ﹈ ﹈ ﹈\nD.push(21);        // 栈的现状为：  20  4 21\n                                   1  3  5\n                                   ﹈ ﹈ ﹈\nD.popAtStack(0);   // 返回 20。栈的现状为：       4 21\n                                            1  3  5\n                                            ﹈ ﹈ ﹈\nD.popAtStack(2);   // 返回 21。栈的现状为：       4\n                                            1  3  5\n                                            ﹈ ﹈ ﹈ \nD.pop()            // 返回 5。栈的现状为：        4\n                                            1  3 \n                                            ﹈ ﹈  \nD.pop()            // 返回 4。栈的现状为：    1  3 \n                                           ﹈ ﹈   \nD.pop()            // 返回 3。栈的现状为：    1 \n                                           ﹈   \nD.pop()            // 返回 1。现在没有栈。\nD.pop()            // 返回 -1。仍然没有栈。\n
\n\n

 

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提示：

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"translatedName": "堆（优先队列）", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class DinnerPlates {\npublic:\n DinnerPlates(int capacity) {\n\n }\n \n void push(int val) {\n\n }\n \n int pop() {\n\n }\n \n int popAtStack(int index) {\n\n }\n};\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * DinnerPlates* obj = new DinnerPlates(capacity);\n * obj->push(val);\n * int param_2 = obj->pop();\n * int param_3 = obj->popAtStack(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class DinnerPlates {\n\n public DinnerPlates(int capacity) {\n\n }\n \n public void push(int val) {\n\n }\n \n public int pop() {\n\n }\n \n public int popAtStack(int index) {\n\n }\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * DinnerPlates obj = new DinnerPlates(capacity);\n * obj.push(val);\n * int param_2 = obj.pop();\n * int param_3 = obj.popAtStack(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class DinnerPlates(object):\n\n def __init__(self, capacity):\n \"\"\"\n :type capacity: int\n \"\"\"\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: int\n \"\"\"\n\n\n def popAtStack(self, index):\n \"\"\"\n :type index: int\n :rtype: int\n \"\"\"\n\n\n\n# Your DinnerPlates object will be instantiated and called as such:\n# obj = DinnerPlates(capacity)\n# obj.push(val)\n# param_2 = obj.pop()\n# param_3 = obj.popAtStack(index)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class DinnerPlates:\n\n def __init__(self, capacity: int):\n\n\n def push(self, val: int) -> None:\n\n\n def pop(self) -> int:\n\n\n def popAtStack(self, index: int) -> int:\n\n\n\n# Your DinnerPlates object will be instantiated and called as such:\n# obj = DinnerPlates(capacity)\n# obj.push(val)\n# param_2 = obj.pop()\n# param_3 = obj.popAtStack(index)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n\n} DinnerPlates;\n\n\nDinnerPlates* dinnerPlatesCreate(int capacity) {\n\n}\n\nvoid dinnerPlatesPush(DinnerPlates* obj, int val) {\n\n}\n\nint dinnerPlatesPop(DinnerPlates* obj) {\n\n}\n\nint dinnerPlatesPopAtStack(DinnerPlates* obj, int index) {\n\n}\n\nvoid dinnerPlatesFree(DinnerPlates* obj) {\n\n}\n\n/**\n * Your DinnerPlates struct will be instantiated and called as such:\n * DinnerPlates* obj = dinnerPlatesCreate(capacity);\n * dinnerPlatesPush(obj, val);\n \n * int param_2 = dinnerPlatesPop(obj);\n \n * int param_3 = dinnerPlatesPopAtStack(obj, index);\n \n * dinnerPlatesFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class DinnerPlates {\n\n public DinnerPlates(int capacity) {\n\n }\n \n public void Push(int val) {\n\n }\n \n public int Pop() {\n\n }\n \n public int PopAtStack(int index) {\n\n }\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * DinnerPlates obj = new DinnerPlates(capacity);\n * obj.Push(val);\n * int param_2 = obj.Pop();\n * int param_3 = obj.PopAtStack(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} capacity\n */\nvar DinnerPlates = function(capacity) {\n\n};\n\n/** \n * @param {number} val\n * @return {void}\n */\nDinnerPlates.prototype.push = function(val) {\n\n};\n\n/**\n * @return {number}\n */\nDinnerPlates.prototype.pop = function() {\n\n};\n\n/** \n * @param {number} index\n * @return {number}\n */\nDinnerPlates.prototype.popAtStack = function(index) {\n\n};\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * var obj = new DinnerPlates(capacity)\n * obj.push(val)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAtStack(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class DinnerPlates\n\n=begin\n :type capacity: Integer\n=end\n def initialize(capacity)\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: Integer\n=end\n def pop()\n\n end\n\n\n=begin\n :type index: Integer\n :rtype: Integer\n=end\n def pop_at_stack(index)\n\n end\n\n\nend\n\n# Your DinnerPlates object will be instantiated and called as such:\n# obj = DinnerPlates.new(capacity)\n# obj.push(val)\n# param_2 = obj.pop()\n# param_3 = obj.pop_at_stack(index)", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass DinnerPlates {\n\n init(_ capacity: Int) {\n\n }\n \n func push(_ val: Int) {\n\n }\n \n func pop() -> Int {\n\n }\n \n func popAtStack(_ index: Int) -> Int {\n\n }\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * let obj = DinnerPlates(capacity)\n * obj.push(val)\n * let ret_2: Int = obj.pop()\n * let ret_3: Int = obj.popAtStack(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type DinnerPlates struct {\n\n}\n\n\nfunc Constructor(capacity int) DinnerPlates {\n\n}\n\n\nfunc (this *DinnerPlates) Push(val int) {\n\n}\n\n\nfunc (this *DinnerPlates) Pop() int {\n\n}\n\n\nfunc (this *DinnerPlates) PopAtStack(index int) int {\n\n}\n\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * obj := Constructor(capacity);\n * obj.Push(val);\n * param_2 := obj.Pop();\n * param_3 := obj.PopAtStack(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class DinnerPlates(_capacity: Int) {\n\n def push(`val`: Int) {\n\n }\n\n def pop(): Int = {\n\n }\n\n def popAtStack(index: Int): Int = {\n\n }\n\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * var obj = new DinnerPlates(capacity)\n * obj.push(`val`)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAtStack(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class DinnerPlates(capacity: Int) {\n\n fun push(`val`: Int) {\n\n }\n\n fun pop(): Int {\n\n }\n\n fun popAtStack(index: Int): Int {\n\n }\n\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * var obj = DinnerPlates(capacity)\n * obj.push(`val`)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAtStack(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct DinnerPlates {\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 DinnerPlates {\n\n fn new(capacity: i32) -> Self {\n\n }\n \n fn push(&self, val: i32) {\n\n }\n \n fn pop(&self) -> i32 {\n\n }\n \n fn pop_at_stack(&self, index: i32) -> i32 {\n\n }\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * let obj = DinnerPlates::new(capacity);\n * obj.push(val);\n * let ret_2: i32 = obj.pop();\n * let ret_3: i32 = obj.pop_at_stack(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class DinnerPlates {\n /**\n * @param Integer $capacity\n */\n function __construct($capacity) {\n\n }\n\n /**\n * @param Integer $val\n * @return NULL\n */\n function push($val) {\n\n }\n\n /**\n * @return Integer\n */\n function pop() {\n\n }\n\n /**\n * @param Integer $index\n * @return Integer\n */\n function popAtStack($index) {\n\n }\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * $obj = DinnerPlates($capacity);\n * $obj->push($val);\n * $ret_2 = $obj->pop();\n * $ret_3 = $obj->popAtStack($index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class DinnerPlates {\n constructor(capacity: number) {\n\n }\n\n push(val: number): void {\n\n }\n\n pop(): number {\n\n }\n\n popAtStack(index: number): number {\n\n }\n}\n\n/**\n * Your DinnerPlates object will be instantiated and called as such:\n * var obj = new DinnerPlates(capacity)\n * obj.push(val)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAtStack(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define dinner-plates%\n (class object%\n (super-new)\n\n ; capacity : exact-integer?\n (init-field\n capacity)\n \n ; push : exact-integer? -> void?\n (define/public (push val)\n\n )\n ; pop : -> exact-integer?\n (define/public (pop)\n\n )\n ; pop-at-stack : exact-integer? -> exact-integer?\n (define/public (pop-at-stack index)\n\n )))\n\n;; Your dinner-plates% object will be instantiated and called as such:\n;; (define obj (new dinner-plates% [capacity capacity]))\n;; (send obj push val)\n;; (define param_2 (send obj pop))\n;; (define param_3 (send obj pop-at-stack index))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec dinner_plates_init_(Capacity :: integer()) -> any().\ndinner_plates_init_(Capacity) ->\n .\n\n-spec dinner_plates_push(Val :: integer()) -> any().\ndinner_plates_push(Val) ->\n .\n\n-spec dinner_plates_pop() -> integer().\ndinner_plates_pop() ->\n .\n\n-spec dinner_plates_pop_at_stack(Index :: integer()) -> integer().\ndinner_plates_pop_at_stack(Index) ->\n .\n\n\n%% Your functions will be called as such:\n%% dinner_plates_init_(Capacity),\n%% dinner_plates_push(Val),\n%% Param_2 = dinner_plates_pop(),\n%% Param_3 = dinner_plates_pop_at_stack(Index),\n\n%% dinner_plates_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "defmodule DinnerPlates do\n @spec init_(capacity :: integer) :: any\n def init_(capacity) do\n\n end\n\n @spec push(val :: integer) :: any\n def push(val) do\n\n end\n\n @spec pop() :: integer\n def pop() do\n\n end\n\n @spec pop_at_stack(index :: integer) :: integer\n def pop_at_stack(index) do\n\n end\nend\n\n# Your functions will be called as such:\n# DinnerPlates.init_(capacity)\n# DinnerPlates.push(val)\n# param_2 = DinnerPlates.pop()\n# param_3 = DinnerPlates.pop_at_stack(index)\n\n# DinnerPlates.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"2.9K\", \"totalSubmission\": \"10.9K\", \"totalAcceptedRaw\": 2904, \"totalSubmissionRaw\": 10882, \"acRate\": \"26.7%\"}", "hints": [ "Use a data structure to save the plate status. You may need to operate the exact index. Maintain the leftmost vacant stack and the rightmost non-empty stack.", "Use a list of stack to store the plate status. Use heap to maintain the leftmost and rightmost valid stack." ], "solution": null, "status": null, "sampleTestCase": "[\"DinnerPlates\",\"push\",\"push\",\"push\",\"push\",\"push\",\"popAtStack\",\"push\",\"push\",\"popAtStack\",\"popAtStack\",\"pop\",\"pop\",\"pop\",\"pop\",\"pop\"]\n[[2],[1],[2],[3],[4],[5],[0],[20],[21],[0],[2],[],[],[],[],[]]", "metaData": "{\n \"classname\": \"DinnerPlates\",\n \"constructor\": {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"capacity\"\n }\n ]\n },\n \"methods\": [\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"val\"\n }\n ],\n \"name\": \"push\",\n \"return\": {\n \"type\": \"void\"\n }\n },\n {\n \"params\": [],\n \"name\": \"pop\",\n \"return\": {\n \"type\": \"integer\"\n }\n },\n {\n \"params\": [\n {\n \"type\": \"integer\",\n \"name\": \"index\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n },\n \"name\": \"popAtStack\"\n }\n ],\n \"return\": {\n \"type\": \"boolean\"\n },\n \"systemdesign\": true\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "envInfo": "{\"cpp\":[\"C++\",\"

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