mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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192 lines
17 KiB
JSON
192 lines
17 KiB
JSON
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"questionId": "1275",
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"title": "Validate Binary Tree Nodes",
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"content": "<p>You have <code>n</code> binary tree nodes numbered from <code>0</code> to <code>n - 1</code> where node <code>i</code> has two children <code>leftChild[i]</code> and <code>rightChild[i]</code>, return <code>true</code> if and only if <strong>all</strong> the given nodes form <strong>exactly one</strong> valid binary tree.</p>\n\n<p>If node <code>i</code> has no left child then <code>leftChild[i]</code> will equal <code>-1</code>, similarly for the right child.</p>\n\n<p>Note that the nodes have no values and that we only use the node numbers in this problem.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/08/23/1503_ex1.png\" style=\"width: 195px; height: 287px;\" />\n<pre>\n<strong>Input:</strong> n = 4, leftChild = [1,-1,3,-1], rightChild = [2,-1,-1,-1]\n<strong>Output:</strong> true\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/08/23/1503_ex2.png\" style=\"width: 183px; height: 272px;\" />\n<pre>\n<strong>Input:</strong> n = 4, leftChild = [1,-1,3,-1], rightChild = [2,3,-1,-1]\n<strong>Output:</strong> false\n</pre>\n\n<p><strong>Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/08/23/1503_ex3.png\" style=\"width: 82px; height: 174px;\" />\n<pre>\n<strong>Input:</strong> n = 2, leftChild = [1,0], rightChild = [-1,-1]\n<strong>Output:</strong> false\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == leftChild.length == rightChild.length</code></li>\n\t<li><code>1 <= n <= 10<sup>4</sup></code></li>\n\t<li><code>-1 <= leftChild[i], rightChild[i] <= n - 1</code></li>\n</ul>\n",
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"difficulty": "Medium",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\npublic:\n bool validateBinaryTreeNodes(int n, vector<int>& leftChild, vector<int>& rightChild) {\n \n }\n};",
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"code": "class Solution(object):\n def validateBinaryTreeNodes(self, n, leftChild, rightChild):\n \"\"\"\n :type n: int\n :type leftChild: List[int]\n :type rightChild: List[int]\n :rtype: bool\n \"\"\"\n ",
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"code": "# @param {Integer} n\n# @param {Integer[]} left_child\n# @param {Integer[]} right_child\n# @return {Boolean}\ndef validate_binary_tree_nodes(n, left_child, right_child)\n \nend",
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"code": "class Solution {\n func validateBinaryTreeNodes(_ n: Int, _ leftChild: [Int], _ rightChild: [Int]) -> Bool {\n \n }\n}",
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"code": "func validateBinaryTreeNodes(n int, leftChild []int, rightChild []int) bool {\n \n}",
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"code": "object Solution {\n def validateBinaryTreeNodes(n: Int, leftChild: Array[Int], rightChild: Array[Int]): Boolean = {\n \n }\n}",
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"code": "class Solution {\n fun validateBinaryTreeNodes(n: Int, leftChild: IntArray, rightChild: IntArray): Boolean {\n \n }\n}",
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn validate_binary_tree_nodes(n: i32, left_child: Vec<i32>, right_child: Vec<i32>) -> bool {\n \n }\n}",
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"code": "class Solution {\n\n /**\n * @param Integer $n\n * @param Integer[] $leftChild\n * @param Integer[] $rightChild\n * @return Boolean\n */\n function validateBinaryTreeNodes($n, $leftChild, $rightChild) {\n \n }\n}",
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"code": "function validateBinaryTreeNodes(n: number, leftChild: number[], rightChild: number[]): boolean {\n\n};",
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"code": "(define/contract (validate-binary-tree-nodes n leftChild rightChild)\n (-> exact-integer? (listof exact-integer?) (listof exact-integer?) boolean?)\n\n )",
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"code": "-spec validate_binary_tree_nodes(N :: integer(), LeftChild :: [integer()], RightChild :: [integer()]) -> boolean().\nvalidate_binary_tree_nodes(N, LeftChild, RightChild) ->\n .",
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"code": "defmodule Solution do\n @spec validate_binary_tree_nodes(n :: integer, left_child :: [integer], right_child :: [integer]) :: boolean\n def validate_binary_tree_nodes(n, left_child, right_child) do\n\n end\nend",
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"Find the parent of each node.",
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"A valid tree must have nodes with only one parent and exactly one node with no parent."
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