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"translatedContent": "<p>在字典(单词列表) <code>wordList</code> 中,从单词 <code>beginWord</code><em> </em>和 <code>endWord</code> 的 <strong>转换序列 </strong>是一个按下述规格形成的序列:</p>\n\n<ul>\n\t<li>序列中第一个单词是 <code>beginWord</code> 。</li>\n\t<li>序列中最后一个单词是 <code>endWord</code> 。</li>\n\t<li>每次转换只能改变一个字母。</li>\n\t<li>转换过程中的中间单词必须是字典 <code>wordList</code> 中的单词。</li>\n</ul>\n\n<p>给定两个长度相同但内容不同的单词<em> </em><code>beginWord</code><em> </em>和 <code>endWord</code> 和一个字典 <code>wordList</code> ,找到从 <code>beginWord</code> 到 <code>endWord</code> 的 <strong>最短转换序列</strong> 中的 <strong>单词数目</strong> 。如果不存在这样的转换序列,返回 0。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log","cog"]\n<strong>输出:</strong>5\n<strong>解释:</strong>一个最短转换序列是 "hit" -> "hot" -> "dot" -> "dog" -> "cog", 返回它的长度 5。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>beginWord = "hit", endWord = "cog", wordList = ["hot","dot","dog","lot","log"]\n<strong>输出:</strong>0\n<strong>解释:</strong>endWord "cog" 不在字典中,所以无法进行转换。</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= beginWord.length <= 10</code></li>\n\t<li><code>endWord.length == beginWord.length</code></li>\n\t<li><code>1 <= wordList.length <= 5000</code></li>\n\t<li><code>wordList[i].length == beginWord.length</code></li>\n\t<li><code>beginWord</code>、<code>endWord</code> 和 <code>wordList[i]</code> 由小写英文字母组成</li>\n\t<li><code>beginWord != endWord</code></li>\n\t<li><code>wordList</code> 中的所有字符串 <strong>互不相同</strong></li>\n</ul>\n\n<p> </p>\n\n<p><meta charset=\"UTF-8\" />注意:本题与主站 127 题相同: <a href=\"https://leetcode-cn.com/problems/word-ladder/\">https://leetcode-cn.com/problems/word-ladder/</a></p>\n",
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