mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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190 lines
28 KiB
JSON
190 lines
28 KiB
JSON
{
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"questionId": "1030",
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"questionFrontendId": "988",
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"categoryTitle": "Algorithms",
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"boundTopicId": 2940,
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"title": "Smallest String Starting From Leaf",
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"content": "<p>You are given the <code>root</code> of a binary tree where each node has a value in the range <code>[0, 25]</code> representing the letters <code>'a'</code> to <code>'z'</code>.</p>\n\n<p>Return <em>the <strong>lexicographically smallest</strong> string that starts at a leaf of this tree and ends at the root</em>.</p>\n\n<p>As a reminder, any shorter prefix of a string is <strong>lexicographically smaller</strong>.</p>\n\n<ul>\n\t<li>For example, <code>"ab"</code> is lexicographically smaller than <code>"aba"</code>.</li>\n</ul>\n\n<p>A leaf of a node is a node that has no children.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/30/tree1.png\" style=\"width: 534px; height: 358px;\" />\n<pre>\n<strong>Input:</strong> root = [0,1,2,3,4,3,4]\n<strong>Output:</strong> "dba"\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/30/tree2.png\" style=\"width: 534px; height: 358px;\" />\n<pre>\n<strong>Input:</strong> root = [25,1,3,1,3,0,2]\n<strong>Output:</strong> "adz"\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/02/01/tree3.png\" style=\"height: 490px; width: 468px;\" />\n<pre>\n<strong>Input:</strong> root = [2,2,1,null,1,0,null,0]\n<strong>Output:</strong> "abc"\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, 8500]</code>.</li>\n\t<li><code>0 <= Node.val <= 25</code></li>\n</ul>\n",
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"translatedTitle": "从叶结点开始的最小字符串",
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"translatedContent": "<p>给定一颗根结点为 <code>root</code> 的二叉树，树中的每一个结点都有一个 <code>[0, 25]</code> 范围内的值，分别代表字母 <code>'a'</code> 到 <code>'z'</code>。</p>\n\n<p>返回 <em><strong>按字典序最小</strong> 的字符串，该字符串从这棵树的一个叶结点开始，到根结点结束</em>。</p>\n\n<blockquote>\n<p>注<strong>：</strong>字符串中任何较短的前缀在 <strong>字典序上</strong> 都是 <strong>较小</strong> 的：</p>\n\n<ul>\n\t<li>例如，在字典序上 <code>\"ab\"</code> 比 <code>\"aba\"</code> 要小。叶结点是指没有子结点的结点。 </li>\n</ul>\n</blockquote>\n\n<p>节点的叶节点是没有子节点的节点。</p>\n\n<p> </p>\n\n<ol>\n</ol>\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/2019/02/02/tree1.png\" style=\"height: 358px; width: 534px;\" /></strong></p>\n\n<pre>\n<strong>输入：</strong>root = [0,1,2,3,4,3,4]\n<strong>输出：</strong>\"dba\"\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2019/01/30/tree2.png\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [25,1,3,1,3,0,2]\n<strong>输出：</strong>\"adz\"\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2019/02/01/tree3.png\" style=\"height: 513px; width: 490px;\" /></p>\n\n<pre>\n<strong>输入：</strong>root = [2,2,1,null,1,0,null,0]\n<strong>输出：</strong>\"abc\"\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>给定树的结点数在 <code>[1, 8500]</code> 范围内</li>\n\t<li><code>0 <= Node.val <= 25</code></li>\n</ul>\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 string SmallestFromLeaf(TreeNode root) {\n\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 $root\n * @return String\n */\n function smallestFromLeaf($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 smallestFromLeaf(_ root: TreeNode?) -> String {\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 {String}\ndef smallest_from_leaf(root)\n\nend",
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