{ "data": { "question": { "questionId": "955", "questionFrontendId": "919", "categoryTitle": "Algorithms", "boundTopicId": 1975, "title": "Complete Binary Tree Inserter", "titleSlug": "complete-binary-tree-inserter", "content": "

A complete binary tree is a binary tree in which every level, except possibly the last, is completely filled, and all nodes are as far left as possible.

\n\n

Design an algorithm to insert a new node to a complete binary tree keeping it complete after the insertion.

\n\n

Implement the CBTInserter class:

\n\n\n\n

 

\n

Example 1:

\n\"\"\n
\nInput\n["CBTInserter", "insert", "insert", "get_root"]\n[[[1, 2]], [3], [4], []]\nOutput\n[null, 1, 2, [1, 2, 3, 4]]\n\nExplanation\nCBTInserter cBTInserter = new CBTInserter([1, 2]);\ncBTInserter.insert(3);  // return 1\ncBTInserter.insert(4);  // return 2\ncBTInserter.get_root(); // return [1, 2, 3, 4]\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "完全二叉树插入器", "translatedContent": "

完全二叉树 是每一层（除最后一层外）都是完全填充（即，节点数达到最大）的，并且所有的节点都尽可能地集中在左侧。

\n\n

设计一种算法，将一个新节点插入到一棵完全二叉树中，并在插入后保持其完整。

\n\n

实现 CBTInserter 类:

\n\n\n\n

 

\n\n
    \n
\n\n

示例 1：

\n\n

\n\n
\n输入\n[\"CBTInserter\", \"insert\", \"insert\", \"get_root\"]\n[[[1, 2]], [3], [4], []]\n输出\n[null, 1, 2, [1, 2, 3, 4]]\n\n解释\nCBTInserter cBTInserter = new CBTInserter([1, 2]);\ncBTInserter.insert(3);  // 返回 1\ncBTInserter.insert(4);  // 返回 2\ncBTInserter.get_root(); // 返回 [1, 2, 3, 4]
\n\n

 

\n\n

提示：

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"design", "translatedName": "设计", "__typename": "TopicTagNode" }, { "name": "Binary Tree", "slug": "binary-tree", "translatedName": "二叉树", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "/**\n * Definition for a binary tree node.\n * struct TreeNode {\n * int val;\n * TreeNode *left;\n * TreeNode *right;\n * TreeNode() : val(0), left(nullptr), right(nullptr) {}\n * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}\n * TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}\n * };\n */\nclass CBTInserter {\npublic:\n CBTInserter(TreeNode* root) {\n \n }\n \n int insert(int val) {\n \n }\n \n TreeNode* get_root() {\n \n }\n};\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * CBTInserter* obj = new CBTInserter(root);\n * int param_1 = obj->insert(val);\n * TreeNode* param_2 = obj->get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n * int val;\n * TreeNode left;\n * TreeNode right;\n * TreeNode() {}\n * TreeNode(int val) { this.val = val; }\n * TreeNode(int val, TreeNode left, TreeNode right) {\n * this.val = val;\n * this.left = left;\n * this.right = right;\n * }\n * }\n */\nclass CBTInserter {\n\n public CBTInserter(TreeNode root) {\n \n }\n \n public int insert(int val) {\n \n }\n \n public TreeNode get_root() {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * CBTInserter obj = new CBTInserter(root);\n * int param_1 = obj.insert(val);\n * TreeNode param_2 = obj.get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "# Definition for a binary tree node.\n# class TreeNode(object):\n# def __init__(self, val=0, left=None, right=None):\n# self.val = val\n# self.left = left\n# self.right = right\nclass CBTInserter(object):\n\n def __init__(self, root):\n \"\"\"\n :type root: Optional[TreeNode]\n \"\"\"\n \n\n def insert(self, val):\n \"\"\"\n :type val: int\n :rtype: int\n \"\"\"\n \n\n def get_root(self):\n \"\"\"\n :rtype: Optional[TreeNode]\n \"\"\"\n \n\n\n# Your CBTInserter object will be instantiated and called as such:\n# obj = CBTInserter(root)\n# param_1 = obj.insert(val)\n# param_2 = obj.get_root()", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "# Definition for a binary tree node.\n# class TreeNode:\n# def __init__(self, val=0, left=None, right=None):\n# self.val = val\n# self.left = left\n# self.right = right\nclass CBTInserter:\n\n def __init__(self, root: Optional[TreeNode]):\n \n\n def insert(self, val: int) -> int:\n \n\n def get_root(self) -> Optional[TreeNode]:\n \n\n\n# Your CBTInserter object will be instantiated and called as such:\n# obj = CBTInserter(root)\n# param_1 = obj.insert(val)\n# param_2 = obj.get_root()", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "/**\n * Definition for a binary tree node.\n * struct TreeNode {\n * int val;\n * struct TreeNode *left;\n * struct TreeNode *right;\n * };\n */\n\n\n\ntypedef struct {\n \n} CBTInserter;\n\n\nCBTInserter* cBTInserterCreate(struct TreeNode* root) {\n \n}\n\nint cBTInserterInsert(CBTInserter* obj, int val) {\n \n}\n\nstruct TreeNode* cBTInserterGet_root(CBTInserter* obj) {\n \n}\n\nvoid cBTInserterFree(CBTInserter* obj) {\n \n}\n\n/**\n * Your CBTInserter struct will be instantiated and called as such:\n * CBTInserter* obj = cBTInserterCreate(root);\n * int param_1 = cBTInserterInsert(obj, val);\n \n * struct TreeNode* param_2 = cBTInserterGet_root(obj);\n \n * cBTInserterFree(obj);\n*/", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n * public int val;\n * public TreeNode left;\n * public TreeNode right;\n * public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {\n * this.val = val;\n * this.left = left;\n * this.right = right;\n * }\n * }\n */\npublic class CBTInserter {\n\n public CBTInserter(TreeNode root) {\n \n }\n \n public int Insert(int val) {\n \n }\n \n public TreeNode Get_root() {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * CBTInserter obj = new CBTInserter(root);\n * int param_1 = obj.Insert(val);\n * TreeNode param_2 = obj.Get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * Definition for a binary tree node.\n * function TreeNode(val, left, right) {\n * this.val = (val===undefined ? 0 : val)\n * this.left = (left===undefined ? null : left)\n * this.right = (right===undefined ? null : right)\n * }\n */\n/**\n * @param {TreeNode} root\n */\nvar CBTInserter = function(root) {\n \n};\n\n/** \n * @param {number} val\n * @return {number}\n */\nCBTInserter.prototype.insert = function(val) {\n \n};\n\n/**\n * @return {TreeNode}\n */\nCBTInserter.prototype.get_root = function() {\n \n};\n\n/** \n * Your CBTInserter object will be instantiated and called as such:\n * var obj = new CBTInserter(root)\n * var param_1 = obj.insert(val)\n * var param_2 = obj.get_root()\n */", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n * val: number\n * left: TreeNode | null\n * right: TreeNode | null\n * constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {\n * this.val = (val===undefined ? 0 : val)\n * this.left = (left===undefined ? null : left)\n * this.right = (right===undefined ? null : right)\n * }\n * }\n */\n\nclass CBTInserter {\n constructor(root: TreeNode | null) {\n \n }\n\n insert(val: number): number {\n \n }\n\n get_root(): TreeNode | null {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * var obj = new CBTInserter(root)\n * var param_1 = obj.insert(val)\n * var param_2 = obj.get_root()\n */", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n * public $val = null;\n * public $left = null;\n * public $right = null;\n * function __construct($val = 0, $left = null, $right = null) {\n * $this->val = $val;\n * $this->left = $left;\n * $this->right = $right;\n * }\n * }\n */\nclass CBTInserter {\n /**\n * @param TreeNode $root\n */\n function __construct($root) {\n \n }\n \n /**\n * @param Integer $val\n * @return Integer\n */\n function insert($val) {\n \n }\n \n /**\n * @return TreeNode\n */\n function get_root() {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * $obj = CBTInserter($root);\n * $ret_1 = $obj->insert($val);\n * $ret_2 = $obj->get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n * public var val: Int\n * public var left: TreeNode?\n * public var right: TreeNode?\n * public init() { self.val = 0; self.left = nil; self.right = nil; }\n * public init(_ val: Int) { self.val = val; self.left = nil; self.right = nil; }\n * public init(_ val: Int, _ left: TreeNode?, _ right: TreeNode?) {\n * self.val = val\n * self.left = left\n * self.right = right\n * }\n * }\n */\n\nclass CBTInserter {\n\n init(_ root: TreeNode?) {\n \n }\n \n func insert(_ val: Int) -> Int {\n \n }\n \n func get_root() -> TreeNode? {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * let obj = CBTInserter(root)\n * let ret_1: Int = obj.insert(val)\n * let ret_2: TreeNode? = obj.get_root()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "/**\n * Example:\n * var ti = TreeNode(5)\n * var v = ti.`val`\n * Definition for a binary tree node.\n * class TreeNode(var `val`: Int) {\n * var left: TreeNode? = null\n * var right: TreeNode? = null\n * }\n */\nclass CBTInserter(root: TreeNode?) {\n\n fun insert(`val`: Int): Int {\n \n }\n\n fun get_root(): TreeNode? {\n \n }\n\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * var obj = CBTInserter(root)\n * var param_1 = obj.insert(`val`)\n * var param_2 = obj.get_root()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode {\n * int val;\n * TreeNode? left;\n * TreeNode? right;\n * TreeNode([this.val = 0, this.left, this.right]);\n * }\n */\nclass CBTInserter {\n\n CBTInserter(TreeNode? root) {\n \n }\n \n int insert(int val) {\n \n }\n \n TreeNode? get_root() {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * CBTInserter obj = CBTInserter(root);\n * int param1 = obj.insert(val);\n * TreeNode? param2 = obj.get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "/**\n * Definition for a binary tree node.\n * type TreeNode struct {\n * Val int\n * Left *TreeNode\n * Right *TreeNode\n * }\n */\ntype CBTInserter struct {\n \n}\n\n\nfunc Constructor(root *TreeNode) CBTInserter {\n \n}\n\n\nfunc (this *CBTInserter) Insert(val int) int {\n \n}\n\n\nfunc (this *CBTInserter) Get_root() *TreeNode {\n \n}\n\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * obj := Constructor(root);\n * param_1 := obj.Insert(val);\n * param_2 := obj.Get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# Definition for a binary tree node.\n# class TreeNode\n# attr_accessor :val, :left, :right\n# def initialize(val = 0, left = nil, right = nil)\n# @val = val\n# @left = left\n# @right = right\n# end\n# end\nclass CBTInserter\n\n=begin\n :type root: TreeNode\n=end\n def initialize(root)\n \n end\n\n\n=begin\n :type val: Integer\n :rtype: Integer\n=end\n def insert(val)\n \n end\n\n\n=begin\n :rtype: TreeNode\n=end\n def get_root()\n \n end\n\n\nend\n\n# Your CBTInserter object will be instantiated and called as such:\n# obj = CBTInserter.new(root)\n# param_1 = obj.insert(val)\n# param_2 = obj.get_root()", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "/**\n * Definition for a binary tree node.\n * class TreeNode(_value: Int = 0, _left: TreeNode = null, _right: TreeNode = null) {\n * var value: Int = _value\n * var left: TreeNode = _left\n * var right: TreeNode = _right\n * }\n */\nclass CBTInserter(_root: TreeNode) {\n\n def insert(`val`: Int): Int = {\n \n }\n\n def get_root(): TreeNode = {\n \n }\n\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * val obj = new CBTInserter(root)\n * val param_1 = obj.insert(`val`)\n * val param_2 = obj.get_root()\n */", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "// Definition for a binary tree node.\n// #[derive(Debug, PartialEq, Eq)]\n// pub struct TreeNode {\n// pub val: i32,\n// pub left: Option>>,\n// pub right: Option>>,\n// }\n// \n// impl TreeNode {\n// #[inline]\n// pub fn new(val: i32) -> Self {\n// TreeNode {\n// val,\n// left: None,\n// right: None\n// }\n// }\n// }\nstruct CBTInserter {\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 CBTInserter {\n\n fn new(root: Option>>) -> Self {\n \n }\n \n fn insert(&self, val: i32) -> i32 {\n \n }\n \n fn get_root(&self) -> Option>> {\n \n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * let obj = CBTInserter::new(root);\n * let ret_1: i32 = obj.insert(val);\n * let ret_2: Option>> = obj.get_root();\n */", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "; Definition for a binary tree node.\n#|\n\n; val : integer?\n; left : (or/c tree-node? #f)\n; right : (or/c tree-node? #f)\n(struct tree-node\n (val left right) #:mutable #:transparent)\n\n; constructor\n(define (make-tree-node [val 0])\n (tree-node val #f #f))\n\n|#\n\n(define cbt-inserter%\n (class object%\n (super-new)\n \n ; root : (or/c tree-node? #f)\n (init-field\n root)\n \n ; insert : exact-integer? -> exact-integer?\n (define/public (insert val)\n )\n ; get_root : -> (or/c tree-node? #f)\n (define/public (get_root)\n )))\n\n;; Your cbt-inserter% object will be instantiated and called as such:\n;; (define obj (new cbt-inserter% [root root]))\n;; (define param_1 (send obj insert val))\n;; (define param_2 (send obj get_root))", "__typename": "CodeSnippetNode" }, { "lang": "Erlang", "langSlug": "erlang", "code": "%% Definition for a binary tree node.\n%%\n%% -record(tree_node, {val = 0 :: integer(),\n%% left = null :: 'null' | #tree_node{},\n%% right = null :: 'null' | #tree_node{}}).\n\n-spec cbt_inserter_init_(Root :: #tree_node{} | null) -> any().\ncbt_inserter_init_(Root) ->\n .\n\n-spec cbt_inserter_insert(Val :: integer()) -> integer().\ncbt_inserter_insert(Val) ->\n .\n\n-spec cbt_inserter_get_root() -> #tree_node{} | null.\ncbt_inserter_get_root() ->\n .\n\n\n%% Your functions will be called as such:\n%% cbt_inserter_init_(Root),\n%% Param_1 = cbt_inserter_insert(Val),\n%% Param_2 = cbt_inserter_get_root(),\n\n%% cbt_inserter_init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Elixir", "langSlug": "elixir", "code": "# Definition for a binary tree node.\n#\n# defmodule TreeNode do\n# @type t :: %__MODULE__{\n# val: integer,\n# left: TreeNode.t() | nil,\n# right: TreeNode.t() | nil\n# }\n# defstruct val: 0, left: nil, right: nil\n# end\n\ndefmodule CBTInserter do\n @spec init_(root :: TreeNode.t | nil) :: any\n def init_(root) do\n \n end\n\n @spec insert(val :: integer) :: integer\n def insert(val) do\n \n end\n\n @spec get_root() :: TreeNode.t | nil\n def get_root() do\n \n end\nend\n\n# Your functions will be called as such:\n# CBTInserter.init_(root)\n# param_1 = CBTInserter.insert(val)\n# param_2 = CBTInserter.get_root()\n\n# CBTInserter.init_ will be called before every test case, in which you can do some necessary initializations.", "__typename": "CodeSnippetNode" }, { "lang": "Cangjie", "langSlug": "cangjie", "code": "/**\n * Definition for a binary tree node.\n * public class BinaryTreeNode {\n * public var val: Int64\n * public var left: ?BinaryTreeNode\n * public var right: ?BinaryTreeNode\n * public init() {\n * val = 0\n * left = None\n * right = None\n * }\n * public init(val: Int64) {\n * this()\n * this.val = val\n * }\n * }\n */\n\nclass CBTInserter {\n init(root: ?BinaryTreeNode) {\n\n }\n \n func insert(val: Int64): Int64 {\n\n }\n \n func get_root(): ?BinaryTreeNode {\n\n }\n}\n\n/**\n * Your CBTInserter object will be instantiated and called as such:\n * let obj: CBTInserter = CBTInserter(root)\n * let param_1 = obj.insert(val)\n * let param_2 = obj.get_root()\n */", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"34.8K\", \"totalSubmission\": \"51.7K\", \"totalAcceptedRaw\": 34788, \"totalSubmissionRaw\": 51721, \"acRate\": \"67.3%\"}", "hints": [], "solution": null, "status": null, "sampleTestCase": "[\"CBTInserter\",\"insert\",\"insert\",\"get_root\"]\n[[[1,2]],[3],[4],[]]", "metaData": "{\n \"classname\": \"CBTInserter\",\n \"maxbytesperline\": 200000,\n \"constructor\": {\n \"params\": [\n {\n \"name\": \"root\",\n \"type\": \"TreeNode\"\n }\n ]\n },\n \"methods\": [\n {\n \"name\": \"insert\",\n \"params\": [\n {\n \"name\": \"val\",\n \"type\": \"integer\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n }\n },\n {\n \"name\": \"get_root\",\n \"params\": [],\n \"return\": {\n \"type\": \"TreeNode\"\n }\n }\n ],\n \"systemdesign\": true,\n 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