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{
"data": {
"question": {
"questionId": "1000362",
"questionFrontendId": "LCP 44",
"categoryTitle": "Algorithms",
"boundTopicId": 1016618,
"title": "开幕式焰火",
"titleSlug": "sZ59z6",
"content": "English description is not available for the problem. Please switch to Chinese.",
"translatedTitle": "开幕式焰火",
"translatedContent": "「力扣挑战赛」开幕式开始了,空中绽放了一颗二叉树形的巨型焰火。\n给定一棵二叉树 `root` 代表焰火,节点值表示巨型焰火这一位置的颜色种类。请帮小扣计算巨型焰火有多少种不同的颜色。\n\n\n**示例 1**\n>输入:`root = [1,3,2,1,null,2]`\n>\n>输出:`3`\n>\n>解释:焰火中有 3 个不同的颜色,值分别为 1、2、3\n\n**示例 2**\n>输入:`root = [3,3,3]`\n>\n>输出:`1`\n>\n>解释:焰火中仅出现 1 个颜色,值为 3\n\n**提示:**\n- `1 <= 节点个数 <= 1000`\n- `1 <= Node.val <= 1000`\n\n\n",
"isPaidOnly": false,
"difficulty": "Easy",
"likes": 41,
"dislikes": 0,
"isLiked": null,
"similarQuestions": "[]",
"contributors": [
{
"username": "LeetCode",
"profileUrl": "/u/leetcode",
"avatarUrl": "https://assets.leetcode.cn/aliyun-lc-upload/uploaded_files/2021/03/73c9f099-abbe-4d94-853f-f8abffd459cd/leetcode.png",
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"code": "/**\n * Definition for a binary tree node.\n * struct TreeNode {\n * int val;\n * TreeNode *left;\n * TreeNode *right;\n * TreeNode(int x) : val(x), left(NULL), right(NULL) {}\n * };\n */\nclass Solution {\npublic:\n int numColor(TreeNode* root) {\n\n }\n};",
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"code": "/**\n * Definition for a binary tree node.\n * public class TreeNode {\n * int val;\n * TreeNode left;\n * TreeNode right;\n * TreeNode(int x) { val = x; }\n * }\n */\nclass Solution {\n public int numColor(TreeNode root) {\n\n }\n}",
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"code": "# Definition for a binary tree node.\n# class TreeNode(object):\n# def __init__(self, x):\n# self.val = x\n# self.left = None\n# self.right = None\nclass Solution(object):\n def numColor(self, root):\n \"\"\"\n :type root: TreeNode\n :rtype: int\n \"\"\"",
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"code": "# Definition for a binary tree node.\n# class TreeNode:\n# def __init__(self, x):\n# self.val = x\n# self.left = None\n# self.right = None\nclass Solution:\n def numColor(self, root: TreeNode) -> int:",
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"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\nint numColor(struct TreeNode* root){\n\n}",
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"code": "/**\n * Definition for a binary tree node.\n * function TreeNode(val) {\n * this.val = val;\n * this.left = this.right = null;\n * }\n */\n/**\n * @param {TreeNode} root\n * @return {number}\n */\nvar numColor = function(root) {\n\n};",
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"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\nfunction numColor(root: TreeNode | null): number {\n\n};",
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"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 Solution {\n fun numColor(root: TreeNode?): Int {\n\n }\n}",
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"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 Solution {\n int numColor(TreeNode? root) {\n\n }\n}",
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"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 */\nfunc numColor(root *TreeNode) int {\n\n}",
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"code": "/**\n * Definition for a binary tree node.\n * class TreeNode(var _value: Int) {\n * var value: Int = _value\n * var left: TreeNode = null\n * var right: TreeNode = null\n * }\n */\nobject Solution {\n def numColor(root: TreeNode): Int = {\n\n }\n}",
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"code": "// Definition for a binary tree node.\n// #[derive(Debug, PartialEq, Eq)]\n// pub struct TreeNode {\n// pub val: i32,\n// pub left: Option<Rc<RefCell<TreeNode>>>,\n// pub right: Option<Rc<RefCell<TreeNode>>>,\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// }\nuse std::rc::Rc;\nuse std::cell::RefCell;\nimpl Solution {\n pub fn num_color(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {\n\n }\n}",
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{
"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/contract (num-color root)\n (-> (or/c tree-node? #f) exact-integer?)\n\n )",
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"lang": "Erlang",
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"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 num_color(Root :: #tree_node{} | null) -> integer().\nnum_color(Root) ->\n .",
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"lang": "Elixir",
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"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 Solution do\n @spec num_color(root :: TreeNode.t | nil) :: integer\n def num_color(root) do\n\n end\nend",
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],
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"status": null,
"sampleTestCase": "[1,3,2,1,null,2]",
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