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add leetcode problem-cn part2

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<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>
<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>
<p><strong>示例 1:</strong></p>
<pre><strong>输入:</strong>
beginWord = &quot;hit&quot;,
endWord = &quot;cog&quot;,
wordList = [&quot;hot&quot;,&quot;dot&quot;,&quot;dog&quot;,&quot;lot&quot;,&quot;log&quot;,&quot;cog&quot;]
<strong>输出:</strong>
[&quot;hit&quot;,&quot;hot&quot;,&quot;dot&quot;,&quot;lot&quot;,&quot;log&quot;,&quot;cog&quot;]
</pre>
<p><strong>示例 2:</strong></p>
<pre><strong>输入:</strong>
beginWord = &quot;hit&quot;
endWord = &quot;cog&quot;
wordList = [&quot;hot&quot;,&quot;dot&quot;,&quot;dog&quot;,&quot;lot&quot;,&quot;log&quot;]
<strong>输出: </strong>[]
<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>