{ "data": { "question": { "questionId": "100195", "questionFrontendId": "面试题 03.03", "categoryTitle": "LCCI", "boundTopicId": 49272, "title": "Stack of Plates LCCI", "titleSlug": "stack-of-plates-lcci", "content": "

Imagine a (literal) stack of plates. If the stack gets too high, it might topple. Therefore, in real life, we would likely start a new stack when the previous stack exceeds some threshold. Implement a data structure SetOfStacks that mimics this. SetOfStacks should be composed of several stacks and should create a new stack once the previous one exceeds capacity. SetOfStacks.push() and SetOfStacks.pop() should behave identically to a single stack (that is, pop() should return the same values as it would if there were just a single stack). Follow Up: Implement a function popAt(int index) which performs a pop operation on a specific sub-stack.

\r\n\r\n

You should delete the sub-stack when it becomes empty. pop, popAt should return -1 when there's no element to pop.

\r\n\r\n

Example1:

\r\n\r\n
\r\n Input: \r\n["StackOfPlates", "push", "push", "popAt", "pop", "pop"]\r\n[[1], [1], [2], [1], [], []]\r\n Output: \r\n[null, null, null, 2, 1, -1]\r\n Explanation: \r\n
\r\n\r\n

Example2:

\r\n\r\n
\r\n Input: \r\n["StackOfPlates", "push", "push", "push", "popAt", "popAt", "popAt"]\r\n[[2], [1], [2], [3], [0], [0], [0]]\r\n Output: \r\n[null, null, null, null, 2, 1, 3]\r\n
\r\n", "translatedTitle": "堆盘子", "translatedContent": "

堆盘子。设想有一堆盘子，堆太高可能会倒下来。因此，在现实生活中，盘子堆到一定高度时，我们就会另外堆一堆盘子。请实现数据结构SetOfStacks，模拟这种行为。SetOfStacks应该由多个栈组成，并且在前一个栈填满时新建一个栈。此外，SetOfStacks.push()和SetOfStacks.pop()应该与普通栈的操作方法相同（也就是说，pop()返回的值，应该跟只有一个栈时的情况一样）。 进阶：实现一个popAt(int index)方法，根据指定的子栈，执行pop操作。

\n\n

当某个栈为空时，应当删除该栈。当栈中没有元素或不存在该栈时，pop，popAt 应返回 -1.

\n\n

示例 1：

\n\n
\n 输入：\n[\"StackOfPlates\", \"push\", \"push\", \"popAt\", \"pop\", \"pop\"]\n[[1], [1], [2], [1], [], []]\n 输出：\n[null, null, null, 2, 1, -1]\n
\n\n

示例 2：

\n\n
\n 输入：\n[\"StackOfPlates\", \"push\", \"push\", \"push\", \"popAt\", \"popAt\", \"popAt\"]\n[[2], [1], [2], [3], [0], [0], [0]]\n 输出：\n[null, null, null, null, 2, 1, 3]\n
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"translatedName": "链表", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class StackOfPlates {\npublic:\n StackOfPlates(int cap) {\n \n }\n \n void push(int val) {\n \n }\n \n int pop() {\n \n }\n \n int popAt(int index) {\n \n }\n};\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * StackOfPlates* obj = new StackOfPlates(cap);\n * obj->push(val);\n * int param_2 = obj->pop();\n * int param_3 = obj->popAt(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class StackOfPlates {\n\n public StackOfPlates(int cap) {\n \n }\n \n public void push(int val) {\n \n }\n \n public int pop() {\n \n }\n \n public int popAt(int index) {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * StackOfPlates obj = new StackOfPlates(cap);\n * obj.push(val);\n * int param_2 = obj.pop();\n * int param_3 = obj.popAt(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class StackOfPlates(object):\n\n def __init__(self, cap):\n \"\"\"\n :type cap: 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 popAt(self, index):\n \"\"\"\n :type index: int\n :rtype: int\n \"\"\"\n \n\n\n# Your StackOfPlates object will be instantiated and called as such:\n# obj = StackOfPlates(cap)\n# obj.push(val)\n# param_2 = obj.pop()\n# param_3 = obj.popAt(index)", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class StackOfPlates:\n\n def __init__(self, cap: int):\n \n\n def push(self, val: int) -> None:\n \n\n def pop(self) -> int:\n \n\n def popAt(self, index: int) -> int:\n \n\n\n# Your StackOfPlates object will be instantiated and called as such:\n# obj = StackOfPlates(cap)\n# obj.push(val)\n# param_2 = obj.pop()\n# param_3 = obj.popAt(index)", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\n\ntypedef struct {\n \n} StackOfPlates;\n\n\nStackOfPlates* stackOfPlatesCreate(int cap) {\n \n}\n\nvoid stackOfPlatesPush(StackOfPlates* obj, int val) {\n \n}\n\nint stackOfPlatesPop(StackOfPlates* obj) {\n \n}\n\nint stackOfPlatesPopAt(StackOfPlates* obj, int index) {\n \n}\n\nvoid stackOfPlatesFree(StackOfPlates* obj) {\n \n}\n\n/**\n * Your StackOfPlates struct will be instantiated and called as such:\n * StackOfPlates* obj = stackOfPlatesCreate(cap);\n * stackOfPlatesPush(obj, val);\n \n * int param_2 = stackOfPlatesPop(obj);\n \n * int param_3 = stackOfPlatesPopAt(obj, index);\n \n * stackOfPlatesFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class StackOfPlates {\n\n public StackOfPlates(int cap) {\n \n }\n \n public void Push(int val) {\n \n }\n \n public int Pop() {\n \n }\n \n public int PopAt(int index) {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * StackOfPlates obj = new StackOfPlates(cap);\n * obj.Push(val);\n * int param_2 = obj.Pop();\n * int param_3 = obj.PopAt(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} cap\n */\nvar StackOfPlates = function(cap) {\n \n};\n\n/** \n * @param {number} val\n * @return {void}\n */\nStackOfPlates.prototype.push = function(val) {\n \n};\n\n/**\n * @return {number}\n */\nStackOfPlates.prototype.pop = function() {\n \n};\n\n/** \n * @param {number} index\n * @return {number}\n */\nStackOfPlates.prototype.popAt = function(index) {\n \n};\n\n/** \n * Your StackOfPlates object will be instantiated and called as such:\n * var obj = new StackOfPlates(cap)\n * obj.push(val)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAt(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "class StackOfPlates {\n constructor(cap: number) {\n \n }\n\n push(val: number): void {\n \n }\n\n pop(): number {\n \n }\n\n popAt(index: number): number {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * var obj = new StackOfPlates(cap)\n * obj.push(val)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAt(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class StackOfPlates {\n /**\n * @param Integer $cap\n */\n function __construct($cap) {\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 $index\n * @return Integer\n */\n function popAt($index) {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * $obj = StackOfPlates($cap);\n * $obj->push($val);\n * $ret_2 = $obj->pop();\n * $ret_3 = $obj->popAt($index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "\nclass StackOfPlates {\n\n init(_ cap: Int) {\n \n }\n \n func push(_ val: Int) {\n \n }\n \n func pop() -> Int {\n \n }\n \n func popAt(_ index: Int) -> Int {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * let obj = StackOfPlates(cap)\n * obj.push(val)\n * let ret_2: Int = obj.pop()\n * let ret_3: Int = obj.popAt(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class StackOfPlates(cap: Int) {\n\n fun push(`val`: Int) {\n \n }\n\n fun pop(): Int {\n \n }\n\n fun popAt(index: Int): Int {\n \n }\n\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * var obj = StackOfPlates(cap)\n * obj.push(`val`)\n * var param_2 = obj.pop()\n * var param_3 = obj.popAt(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class StackOfPlates {\n\n StackOfPlates(int cap) {\n \n }\n \n void push(int val) {\n \n }\n \n int pop() {\n \n }\n \n int popAt(int index) {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * StackOfPlates obj = StackOfPlates(cap);\n * obj.push(val);\n * int param2 = obj.pop();\n * int param3 = obj.popAt(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "type StackOfPlates struct {\n \n}\n\n\nfunc Constructor(cap int) StackOfPlates {\n \n}\n\n\nfunc (this *StackOfPlates) Push(val int) {\n \n}\n\n\nfunc (this *StackOfPlates) Pop() int {\n \n}\n\n\nfunc (this *StackOfPlates) PopAt(index int) int {\n \n}\n\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * obj := Constructor(cap);\n * obj.Push(val);\n * param_2 := obj.Pop();\n * param_3 := obj.PopAt(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "class StackOfPlates\n\n=begin\n :type cap: Integer\n=end\n def initialize(cap)\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(index)\n \n end\n\n\nend\n\n# Your StackOfPlates object will be instantiated and called as such:\n# obj = StackOfPlates.new(cap)\n# obj.push(val)\n# param_2 = obj.pop()\n# param_3 = obj.pop_at(index)", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "class StackOfPlates(_cap: Int) {\n\n def push(`val`: Int): Unit = {\n \n }\n\n def pop(): Int = {\n \n }\n\n def popAt(index: Int): Int = {\n \n }\n\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * val obj = new StackOfPlates(cap)\n * obj.push(`val`)\n * val param_2 = obj.pop()\n * val param_3 = obj.popAt(index)\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "struct StackOfPlates {\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 StackOfPlates {\n\n fn new(cap: 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(&self, index: i32) -> i32 {\n \n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * let obj = StackOfPlates::new(cap);\n * obj.push(val);\n * let ret_2: i32 = obj.pop();\n * let ret_3: i32 = obj.pop_at(index);\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define stack-of-plates%\n (class object%\n (super-new)\n \n ; cap : exact-integer?\n (init-field\n cap)\n \n ; push : exact-integer? -> void?\n (define/public (push val)\n )\n ; pop : -> exact-integer?\n (define/public (pop)\n )\n ; pop-at : exact-integer? -> exact-integer?\n (define/public (pop-at index)\n )))\n\n;; Your stack-of-plates% object will be instantiated and called as such:\n;; (define obj (new stack-of-plates% [cap cap]))\n;; (send obj push val)\n;; (define param_2 (send obj pop))\n;; (define param_3 (send obj pop-at index))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "-spec stack_of_plates_init_(Cap :: integer()) -> any().\nstack_of_plates_init_(Cap) ->\n .\n\n-spec stack_of_plates_push(Val :: integer()) -> any().\nstack_of_plates_push(Val) ->\n .\n\n-spec stack_of_plates_pop() -> integer().\nstack_of_plates_pop() ->\n .\n\n-spec stack_of_plates_pop_at(Index :: integer()) -> integer().\nstack_of_plates_pop_at(Index) ->\n .\n\n\n%% Your functions will be called as such:\n%% stack_of_plates_init_(Cap),\n%% stack_of_plates_push(Val),\n%% Param_2 = stack_of_plates_pop(),\n%% Param_3 = stack_of_plates_pop_at(Index),\n\n%% stack_of_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 StackOfPlates do\n @spec init_(cap :: integer) :: any\n def init_(cap) 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(index :: integer) :: integer\n def pop_at(index) do\n \n end\nend\n\n# Your functions will be called as such:\n# StackOfPlates.init_(cap)\n# StackOfPlates.push(val)\n# param_2 = StackOfPlates.pop()\n# param_3 = StackOfPlates.pop_at(index)\n\n# StackOfPlates.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Cangjie", "langSlug": "cangjie", "code": "class StackOfPlates {\n init(cap: Int64) {\n\n }\n \n func push(val: Int64): Unit {\n\n }\n \n func pop(): Int64 {\n\n }\n \n func popAt(index: Int64): Int64 {\n\n }\n}\n\n/**\n * Your StackOfPlates object will be instantiated and called as such:\n * let obj: StackOfPlates = StackOfPlates(cap)\n * obj.push(val)\n * let param_2 = obj.pop()\n * let param_3 = obj.popAt(index)\n */", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"18.9K\", \"totalSubmission\": \"49K\", \"totalAcceptedRaw\": 18930, \"totalSubmissionRaw\": 49040, \"acRate\": \"38.6%\"}", "hints": [ "你需要追踪每个子栈的大小。当一个栈已满时，你可能需要创建一个新栈。", "在一个特定的子栈中弹出一个元素意味着一些栈没有满。这是个问题吗？没有正确的答案，但你应该考虑如何处理这个问题。" ], "solution": null, "status": null, "sampleTestCase": "[\"StackOfPlates\", \"push\", \"push\", \"popAt\", \"pop\", \"pop\"]\n[[1], [1], [2], [1], [], []]", "metaData": "{\"classname\": \"StackOfPlates\", \"maxbytesperline\": 200000, \"systemdesign\": true, \"constructor\": {\"params\": [{\"name\": \"cap\", \"type\": \"integer\"}]}, \"methods\": [{\"name\": \"push\", \"params\": [{\"name\": \"val\", \"type\": \"integer\"}], \"return\": {\"type\": \"void\"}}, {\"name\": \"pop\", \"params\": [], \"return\": {\"type\": \"integer\"}}, {\"name\": \"popAt\", \"params\": [{\"name\": \"index\", 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