mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
25 KiB
JSON
174 lines
25 KiB
JSON
{
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"questionFrontendId": "958",
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"categoryTitle": "Algorithms",
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"boundTopicId": 2552,
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"title": "Check Completeness of a Binary Tree",
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"titleSlug": "check-completeness-of-a-binary-tree",
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"content": "<p>Given the <code>root</code> of a binary tree, determine if it is a <em>complete binary tree</em>.</p>\n\n<p>In a <strong><a href=\"http://en.wikipedia.org/wiki/Binary_tree#Types_of_binary_trees\" target=\"_blank\">complete binary tree</a></strong>, every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible. It can have between <code>1</code> and <code>2<sup>h</sup></code> nodes inclusive at the last level <code>h</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2018/12/15/complete-binary-tree-1.png\" style=\"width: 180px; height: 145px;\" />\n<pre>\n<strong>Input:</strong> root = [1,2,3,4,5,6]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> Every level before the last is full (ie. levels with node-values {1} and {2, 3}), and all nodes in the last level ({4, 5, 6}) are as far left as possible.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2018/12/15/complete-binary-tree-2.png\" style=\"width: 200px; height: 145px;\" />\n<pre>\n<strong>Input:</strong> root = [1,2,3,4,5,null,7]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> The node with value 7 isn't as far left as possible.\n</pre>\n\n<p> </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, 100]</code>.</li>\n\t<li><code>1 <= Node.val <= 1000</code></li>\n</ul>\n",
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"translatedTitle": "二叉树的完全性检验",
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"translatedContent": "<p>给定一个二叉树的<meta charset=\"UTF-8\" /> <code>root</code> ，确定它是否是一个 <em>完全二叉树</em> 。</p>\n\n<p>在一个 <strong><a href=\"https://baike.baidu.com/item/完全二叉树/7773232?fr=aladdin\" target=\"_blank\">完全二叉树</a></strong> 中，除了最后一个关卡外，所有关卡都是完全被填满的，并且最后一个关卡中的所有节点都是尽可能靠左的。它可以包含<meta charset=\"UTF-8\" /> <code>1</code> 到<meta charset=\"UTF-8\" /> <code>2<sup>h</sup></code> 节点之间的最后一级 <code>h</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/12/15/complete-binary-tree-1.png\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [1,2,3,4,5,6]\n<strong>输出：</strong>true\n<strong>解释：</strong>最后一层前的每一层都是满的（即，结点值为 {1} 和 {2,3} 的两层），且最后一层中的所有结点（{4,5,6}）都尽可能地向左。\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/2018/12/15/complete-binary-tree-2.png\" /></strong></p>\n\n<pre>\n<strong>输入：</strong>root = [1,2,3,4,5,null,7]\n<strong>输出：</strong>false\n<strong>解释：</strong>值为 7 的结点没有尽可能靠向左侧。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>树的结点数在范围 <meta charset=\"UTF-8\" /> <code>[1, 100]</code> 内。</li>\n\t<li><code>1 <= Node.val <= 1000</code></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 bool isCompleteTree(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 isCompleteTree(self, root: TreeNode) -> bool:",
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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 bool IsCompleteTree(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 {boolean}\n */\nvar isCompleteTree = function(root) {\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 {Boolean}\ndef is_complete_tree(root)\n\nend",
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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 isCompleteTree(_ root: TreeNode?) -> Bool {\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 isCompleteTree(root *TreeNode) bool {\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 isCompleteTree(root: TreeNode?): Boolean {\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 is_complete_tree(root: Option<Rc<RefCell<TreeNode>>>) -> bool {\n\n }\n}",
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