leetcode-problemset/leetcode-cn/originData/longest-zigzag-path-in-a-binary-tree.json

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        "question": {
            "questionId": "1474",
            "questionFrontendId": "1372",
            "categoryTitle": "Algorithms",
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            "title": "Longest ZigZag Path in a Binary Tree",
            "titleSlug": "longest-zigzag-path-in-a-binary-tree",
            "content": "<p>You are given the <code>root</code> of a binary tree.</p>\n\n<p>A ZigZag path for a binary tree is defined as follow:</p>\n\n<ul>\n\t<li>Choose <strong>any </strong>node in the binary tree and a direction (right or left).</li>\n\t<li>If the current direction is right, move to the right child of the current node; otherwise, move to the left child.</li>\n\t<li>Change the direction from right to left or from left to right.</li>\n\t<li>Repeat the second and third steps until you can&#39;t move in the tree.</li>\n</ul>\n\n<p>Zigzag length is defined as the number of nodes visited - 1. (A single node has a length of 0).</p>\n\n<p>Return <em>the longest <strong>ZigZag</strong> path contained in that tree</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/01/22/sample_1_1702.png\" style=\"width: 221px; height: 383px;\" />\n<pre>\n<strong>Input:</strong> root = [1,null,1,1,1,null,null,1,1,null,1,null,null,null,1]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> Longest ZigZag path in blue nodes (right -&gt; left -&gt; right).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/01/22/sample_2_1702.png\" style=\"width: 157px; height: 329px;\" />\n<pre>\n<strong>Input:</strong> root = [1,1,1,null,1,null,null,1,1,null,1]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> Longest ZigZag path in blue nodes (left -&gt; right -&gt; left -&gt; right).\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> root = [1]\n<strong>Output:</strong> 0\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[1, 5 * 10<sup>4</sup>]</code>.</li>\n\t<li><code>1 &lt;= Node.val &lt;= 100</code></li>\n</ul>\n",
            "translatedTitle": "二叉树中的最长交错路径",
            "translatedContent": "<p>给你一棵以&nbsp;<code>root</code>&nbsp;为根的二叉树，二叉树中的交错路径定义如下：</p>\n\n<ul>\n\t<li>选择二叉树中 <strong>任意</strong>&nbsp;节点和一个方向（左或者右）。</li>\n\t<li>如果前进方向为右，那么移动到当前节点的的右子节点，否则移动到它的左子节点。</li>\n\t<li>改变前进方向：左变右或者右变左。</li>\n\t<li>重复第二步和第三步，直到你在树中无法继续移动。</li>\n</ul>\n\n<p>交错路径的长度定义为：<strong>访问过的节点数目 - 1</strong>（单个节点的路径长度为 0 ）。</p>\n\n<p>请你返回给定树中最长 <strong>交错路径</strong>&nbsp;的长度。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/03/07/sample_1_1702.png\" style=\"height: 283px; width: 151px;\"></strong></p>\n\n<pre><strong>输入：</strong>root = [1,null,1,1,1,null,null,1,1,null,1,null,null,null,1,null,1]\n<strong>输出：</strong>3\n<strong>解释：</strong>蓝色节点为树中最长交错路径（右 -&gt; 左 -&gt; 右）。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/03/07/sample_2_1702.png\" style=\"height: 253px; width: 120px;\"></strong></p>\n\n<pre><strong>输入：</strong>root = [1,1,1,null,1,null,null,1,1,null,1]\n<strong>输出：</strong>4\n<strong>解释：</strong>蓝色节点为树中最长交错路径（左 -&gt; 右 -&gt; 左 -&gt; 右）。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>root = [1]\n<strong>输出：</strong>0\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>每棵树最多有&nbsp;<code>50000</code>&nbsp;个节点。</li>\n\t<li>每个节点的值在&nbsp;<code>[1, 100]</code> 之间。</li>\n</ul>\n",
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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() : 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 Solution {\npublic:\n    int longestZigZag(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() {}\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 Solution {\n    public int longestZigZag(TreeNode root) {\n\n    }\n}",
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                    "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 Solution:\n    def longestZigZag(self, root: Optional[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 */\nint longestZigZag(struct TreeNode* root) {\n    \n}",
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                    "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 Solution {\n    public int LongestZigZag(TreeNode root) {\n\n    }\n}",
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                    "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 * @return {number}\n */\nvar longestZigZag = 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 longestZigZag(root: TreeNode | null): number {\n    \n};",
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                    "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 Solution {\n\n    /**\n     * @param TreeNode $root\n     * @return Integer\n     */\n    function longestZigZag($root) {\n\n    }\n}",
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                    "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 */\nclass Solution {\n    func longestZigZag(_ root: TreeNode?) -> Int {\n\n    }\n}",
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                    "code": "/**\n * Definition for a binary tree node.\n * type TreeNode struct {\n *     Val int\n *     Left *TreeNode\n *     Right *TreeNode\n * }\n */\nfunc longestZigZag(root *TreeNode) int {\n\n}",
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                    "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\n# @param {TreeNode} root\n# @return {Integer}\ndef longest_zig_zag(root)\n\nend",
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                    "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 */\nobject Solution {\n    def longestZigZag(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 longest_zig_zag(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {\n\n    }\n}",
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                    "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 (longest-zig-zag root)\n  (-> (or/c tree-node? #f) exact-integer?)\n  )",
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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 longest_zig_zag(Root :: #tree_node{} | null) -> integer().\nlongest_zig_zag(Root) ->\n  .",
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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 longest_zig_zag(root :: TreeNode.t | nil) :: integer\n  def longest_zig_zag(root) do\n    \n  end\nend",
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