mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
27 KiB
JSON
180 lines
27 KiB
JSON
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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 class=\"example\">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 class=\"example\">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>给你一棵二叉树的根节点<meta charset=\"UTF-8\" /> <code>root</code> ，请你判断这棵树是否是一棵 <strong>完全二叉树</strong> 。</p>\n\n<p>在一棵 <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，除了最后一层外，所有层都被完全填满，并且最后一层中的所有节点都尽可能靠左。最后一层（第 <code>h</code> 层）中可以包含<meta charset=\"UTF-8\" /> <code>1</code> 到<meta charset=\"UTF-8\" /> <code>2<sup>h</sup></code> 个节点。</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，节点值为 {1} 和 {2,3} 的两层），且最后一层中的所有节点（{4,5,6}）尽可能靠左。\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 的节点不满足条件「节点尽可能靠左」。\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>树中节点数目在范围 <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 * 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 $root\n * @return Boolean\n */\n function isCompleteTree($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 isCompleteTree(_ root: TreeNode?) -> Bool {\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 bool isCompleteTree(TreeNode? root) {\n \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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