{ "data": { "question": { "questionId": "126", "questionFrontendId": "126", "categoryTitle": "Algorithms", "boundTopicId": 1453, "title": "Word Ladder II", "titleSlug": "word-ladder-ii", "content": "

A transformation sequence from word beginWord to word endWord using a dictionary wordList is a sequence of words beginWord -> s1 -> s2 -> ... -> sk such that:

\n\n\n\n

Given two words, beginWord and endWord, and a dictionary wordList, return all the shortest transformation sequences from beginWord to endWord, or an empty list if no such sequence exists. Each sequence should be returned as a list of the words [beginWord, s1, s2, ..., sk].

\n\n

 

\n

Example 1:

\n\n
\nInput: beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log","cog"]\nOutput: [["hit","hot","dot","dog","cog"],["hit","hot","lot","log","cog"]]\nExplanation: There are 2 shortest transformation sequences:\n"hit" -> "hot" -> "dot" -> "dog" -> "cog"\n"hit" -> "hot" -> "lot" -> "log" -> "cog"\n
\n\n

Example 2:

\n\n
\nInput: beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log"]\nOutput: []\nExplanation: The endWord "cog" is not in wordList, therefore there is no valid transformation sequence.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "单词接龙 II", "translatedContent": "

按字典 wordList 完成从单词 beginWord 到单词 endWord 转化，一个表示此过程的 转换序列 是形式上像 beginWord -> s1 -> s2 -> ... -> sk 这样的单词序列，并满足：

\n\n
\n
\n\n\n

给你两个单词 beginWord 和 endWord ，以及一个字典 wordList 。请你找出并返回所有从 beginWord 到 endWord 的 最短转换序列 ，如果不存在这样的转换序列，返回一个空列表。每个序列都应该以单词列表 [beginWord, s1, s2, ..., sk] 的形式返回。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：beginWord = \"hit\", endWord = \"cog\", wordList = [\"hot\",\"dot\",\"dog\",\"lot\",\"log\",\"cog\"]\n输出：[[\"hit\",\"hot\",\"dot\",\"dog\",\"cog\"],[\"hit\",\"hot\",\"lot\",\"log\",\"cog\"]]\n解释：存在 2 种最短的转换序列：\n\"hit\" -> \"hot\" -> \"dot\" -> \"dog\" -> \"cog\"\n\"hit\" -> \"hot\" -> \"lot\" -> \"log\" -> \"cog\"\n
\n\n

示例 2：

\n\n
\n输入：beginWord = \"hit\", endWord = \"cog\", wordList = [\"hot\",\"dot\",\"dog\",\"lot\",\"log\"]\n输出：[]\n解释：endWord \"cog\" 不在字典 wordList 中，所以不存在符合要求的转换序列。\n
\n\n

 

\n\n

提示：

\n\n\n
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