{ "data": { "question": { "questionId": "2445", "questionFrontendId": "2368", "categoryTitle": "Algorithms", "boundTopicId": 1723748, "title": "Reachable Nodes With Restrictions", "titleSlug": "reachable-nodes-with-restrictions", "content": "

There is an undirected tree with n nodes labeled from 0 to n - 1 and n - 1 edges.

\n\n

You are given a 2D integer array edges of length n - 1 where edges[i] = [ai, bi] indicates that there is an edge between nodes ai and bi in the tree. You are also given an integer array restricted which represents restricted nodes.

\n\n

Return the maximum number of nodes you can reach from node 0 without visiting a restricted node.

\n\n

Note that node 0 will not be a restricted node.

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: n = 7, edges = [[0,1],[1,2],[3,1],[4,0],[0,5],[5,6]], restricted = [4,5]\nOutput: 4\nExplanation: The diagram above shows the tree.\nWe have that [0,1,2,3] are the only nodes that can be reached from node 0 without visiting a restricted node.\n
\n\n

Example 2:

\n\"\"\n
\nInput: n = 7, edges = [[0,1],[0,2],[0,5],[0,4],[3,2],[6,5]], restricted = [4,2,1]\nOutput: 3\nExplanation: The diagram above shows the tree.\nWe have that [0,5,6] are the only nodes that can be reached from node 0 without visiting a restricted node.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "受限条件下可到达节点的数目", "translatedContent": "

现有一棵由 n 个节点组成的无向树，节点编号从 0 到 n - 1 ，共有 n - 1 条边。

\n\n

给你一个二维整数数组 edges ，长度为 n - 1 ，其中 edges[i] = [ai, bi] 表示树中节点 ai 和 bi 之间存在一条边。另给你一个整数数组 restricted 表示 受限 节点。

\n\n

在不访问受限节点的前提下，返回你可以从节点 0 到达的 最多 节点数目。

\n\n

注意，节点 0 不 会标记为受限节点。

\n\n

 

\n\n

示例 1：

\n\"\"\n
输入：n = 7, edges = [[0,1],[1,2],[3,1],[4,0],[0,5],[5,6]], restricted = [4,5]\n输出：4\n解释：上图所示正是这棵树。\n在不访问受限节点的前提下，只有节点 [0,1,2,3] 可以从节点 0 到达。
\n\n

示例 2：

\n\"\"\n
输入：n = 7, edges = [[0,1],[0,2],[0,5],[0,4],[3,2],[6,5]], restricted = [4,2,1]\n输出：3\n解释：上图所示正是这棵树。\n在不访问受限节点的前提下，只有节点 [0,5,6] 可以从节点 0 到达。\n
\n\n

 

\n\n

提示：

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false, \"erlang\": false, \"elixir\": false, \"pythondata\": false, \"react\": false, \"vanillajs\": false, \"postgresql\": false, \"cangjie\": false}", "topicTags": [ { "name": "Tree", "slug": "tree", "translatedName": "树", "__typename": "TopicTagNode" }, { "name": "Depth-First Search", "slug": "depth-first-search", "translatedName": "深度优先搜索", "__typename": "TopicTagNode" }, { "name": "Breadth-First Search", "slug": "breadth-first-search", "translatedName": "广度优先搜索", "__typename": "TopicTagNode" }, { "name": "Union Find", "slug": "union-find", "translatedName": "并查集", "__typename": "TopicTagNode" }, { "name": "Graph", "slug": "graph", "translatedName": "图", "__typename": "TopicTagNode" }, { "name": "Array", "slug": "array", "translatedName": "数组", "__typename": "TopicTagNode" }, { "name": "Hash Table", "slug": "hash-table", "translatedName": "哈希表", "__typename": "TopicTagNode" } ], "companyTagStats": null, "codeSnippets": [ { "lang": "C++", "langSlug": "cpp", "code": "class Solution {\npublic:\n int reachableNodes(int n, vector>& edges, vector& restricted) {\n \n }\n};", "__typename": "CodeSnippetNode" }, { "lang": "Java", "langSlug": "java", "code": "class Solution {\n public int reachableNodes(int n, int[][] edges, int[] restricted) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Python", "langSlug": "python", "code": "class Solution(object):\n def reachableNodes(self, n, edges, restricted):\n \"\"\"\n :type n: int\n :type edges: List[List[int]]\n :type restricted: List[int]\n :rtype: int\n \"\"\"\n ", "__typename": "CodeSnippetNode" }, { "lang": "Python3", "langSlug": "python3", "code": "class Solution:\n def reachableNodes(self, n: int, edges: List[List[int]], restricted: List[int]) -> int:\n ", "__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "int reachableNodes(int n, int** edges, int edgesSize, int* edgesColSize, int* restricted, int restrictedSize) {\n \n}", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class Solution {\n public int ReachableNodes(int n, int[][] edges, int[] restricted) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number} n\n * @param {number[][]} edges\n * @param {number[]} restricted\n * @return {number}\n */\nvar reachableNodes = function(n, edges, restricted) {\n \n};", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "function reachableNodes(n: number, edges: number[][], restricted: number[]): number {\n \n};", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class Solution {\n\n /**\n * @param Integer $n\n * @param Integer[][] $edges\n * @param Integer[] $restricted\n * @return Integer\n */\n function reachableNodes($n, $edges, $restricted) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "class Solution {\n func reachableNodes(_ n: Int, _ edges: [[Int]], _ restricted: [Int]) -> Int {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Solution {\n fun reachableNodes(n: Int, edges: Array, restricted: IntArray): Int {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Dart", "langSlug": "dart", "code": "class Solution {\n int reachableNodes(int n, List> edges, List restricted) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "func reachableNodes(n int, edges [][]int, restricted []int) int {\n \n}", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# @param {Integer} n\n# @param {Integer[][]} edges\n# @param {Integer[]} restricted\n# @return {Integer}\ndef reachable_nodes(n, edges, restricted)\n \nend", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "object Solution {\n def reachableNodes(n: Int, edges: Array[Array[Int]], restricted: Array[Int]): Int = {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "impl Solution {\n pub fn reachable_nodes(n: i32, edges: Vec>, restricted: Vec) -> i32 {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Racket", "langSlug": "racket", "code": "(define/contract (reachable-nodes n edges restricted)\n (-> exact-integer? 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