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{
"data": {
"question": {
"questionId": "1000030",
"questionFrontendId": "面试题 17.22",
"categoryTitle": "LCCI",
"boundTopicId": 93504,
"title": "Word Transformer LCCI",
"titleSlug": "word-transformer-lcci",
"content": "<p>Given two words of equal length that are in a dictionary, write a method to transform one word into another word by changing only one letter at a time. The new word you get in each step must be in the dictionary.</p>\r\n\r\n<p>Write code to return a possible transforming sequence. If there is more than one sequence, return any of them.</p>\r\n\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong>\r\nbeginWord = &quot;hit&quot;,\r\nendWord = &quot;cog&quot;,\r\nwordList = [&quot;hot&quot;,&quot;dot&quot;,&quot;dog&quot;,&quot;lot&quot;,&quot;log&quot;,&quot;cog&quot;]\r\n\r\n<strong>Output:</strong>\r\n[&quot;hit&quot;,&quot;hot&quot;,&quot;dot&quot;,&quot;lot&quot;,&quot;log&quot;,&quot;cog&quot;]\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong>\r\nbeginWord = &quot;hit&quot;\r\nendWord = &quot;cog&quot;\r\nwordList = [&quot;hot&quot;,&quot;dot&quot;,&quot;dog&quot;,&quot;lot&quot;,&quot;log&quot;]\r\n\r\n<strong>Output: </strong>[]\r\n\r\n<strong>Explanation:</strong>&nbsp;<em>endWord</em> &quot;cog&quot; is not in the dictionary, so there&#39;s no possible transforming sequence.</pre>\r\n",
"translatedTitle": "单词转换",
"translatedContent": "<p>给定字典中的两个词,长度相等。写一个方法,把一个词转换成另一个词, 但是一次只能改变一个字符。每一步得到的新词都必须能在字典中找到。</p>\n\n<p>编写一个程序,返回一个可能的转换序列。如有多个可能的转换序列,你可以返回任何一个。</p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre><strong>输入:</strong>\nbeginWord = &quot;hit&quot;,\nendWord = &quot;cog&quot;,\nwordList = [&quot;hot&quot;,&quot;dot&quot;,&quot;dog&quot;,&quot;lot&quot;,&quot;log&quot;,&quot;cog&quot;]\n\n<strong>输出:</strong>\n[&quot;hit&quot;,&quot;hot&quot;,&quot;dot&quot;,&quot;lot&quot;,&quot;log&quot;,&quot;cog&quot;]\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre><strong>输入:</strong>\nbeginWord = &quot;hit&quot;\nendWord = &quot;cog&quot;\nwordList = [&quot;hot&quot;,&quot;dot&quot;,&quot;dog&quot;,&quot;lot&quot;,&quot;log&quot;]\n\n<strong>输出: </strong>[]\n\n<strong>解释:</strong>&nbsp;<em>endWord</em> &quot;cog&quot; 不在字典中,所以不存在符合要求的转换序列。</pre>\n",
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"difficulty": "Medium",
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"slug": "breadth-first-search",
"translatedName": "广度优先搜索",
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"code": "class Solution {\npublic:\n vector<string> findLadders(string beginWord, string endWord, vector<string>& wordList) {\n\n }\n};",
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"code": "class Solution {\n public List<String> findLadders(String beginWord, String endWord, List<String> wordList) {\n\n }\n}",
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"code": "class Solution(object):\n def findLadders(self, beginWord, endWord, wordList):\n \"\"\"\n :type beginWord: str\n :type endWord: str\n :type wordList: List[str]\n :rtype: List[str]\n \"\"\"",
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"code": "class Solution:\n def findLadders(self, beginWord: str, endWord: str, wordList: List[str]) -> List[str]:",
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"code": "\n\n/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nchar** findLadders(char* beginWord, char* endWord, char** wordList, int wordListSize, int* returnSize){\n\n}\n",
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"code": "public class Solution {\n public IList<string> FindLadders(string beginWord, string endWord, IList<string> wordList) {\n\n }\n}",
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"code": "class Solution {\n List<String> findLadders(String beginWord, String endWord, List<String> wordList) {\n\n }\n}",
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"code": "# @param {String} begin_word\n# @param {String} end_word\n# @param {String[]} word_list\n# @return {String[]}\ndef find_ladders(begin_word, end_word, word_list)\n\nend",
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"code": "impl Solution {\n pub fn find_ladders(begin_word: String, end_word: String, word_list: Vec<String>) -> Vec<String> {\n\n }\n}",
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"code": "-spec find_ladders(BeginWord :: unicode:unicode_binary(), EndWord :: unicode:unicode_binary(), WordList :: [unicode:unicode_binary()]) -> [unicode:unicode_binary()].\nfind_ladders(BeginWord, EndWord, WordList) ->\n .",
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"code": "defmodule Solution do\n @spec find_ladders(begin_word :: String.t, end_word :: String.t, word_list :: [String.t]) :: [String.t]\n def find_ladders(begin_word, end_word, word_list) do\n\n end\nend",
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"hints": [
"从一个蛮力的递归解法开始。只需要创建所有一次编辑的单词,检查它们是否在字典中,然后尝试该编辑路径。",
"一旦你有了一个蛮力解法,就可以尝试找到一个更快的方法以得到所有一次编辑的有效单词。当绝大多数字符串都不是有效的字典单词时,你不会想创建所有一次编辑的字符串。",
"为了快速得到编辑距离为1的有效单词试着将字典中的单词以一种有效的方式进行分组。注意b_ll形式的所有单词如bill、ball、bell和bull的编辑距离为1。然而这些并不是仅有的编辑距离为1的单词。",
"创建从通配符形式如b_ll到该通配符所匹配的所有单词的映射。然后当你想要查找与bill相隔编辑距离为1的所有单词时可以在映射中查找_ill、b_ll、bi_l和bil_。",
"你之前的算法可能类似于深度优先搜索。你能使它更快吗?",
"广度优先的搜索通常比深度优先的搜索要快。在最坏的情况下未必如此,但在很多情况下都是这样。为什么?你能找到更快的方法吗?",
"如果同时从起始单词和目标单词开始进行广度优先搜索,结果会怎样?"
],
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"sampleTestCase": "\"hit\"\n\"cog\"\n[\"hot\",\"dot\",\"dog\",\"lot\",\"log\",\"cog\"]",
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