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<p>给定一组单词<code>words</code>,编写一个程序,找出其中的最长单词,且该单词由这组单词中的其他单词组合而成。若有多个长度相同的结果,返回其中字典序最小的一项,若没有符合要求的单词则返回空字符串。</p>
<p><strong>示例:</strong></p>
<pre><strong>输入:</strong> [&quot;cat&quot;,&quot;banana&quot;,&quot;dog&quot;,&quot;nana&quot;,&quot;walk&quot;,&quot;walker&quot;,&quot;dogwalker&quot;]
<strong>输出:</strong> &quot;dogwalker&quot;
<strong>解释:</strong> &quot;dogwalker&quot;可由&quot;dog&quot;&quot;walker&quot;组成。
</pre>
<p><strong>提示:</strong></p>
<ul>
<li><code>0 &lt;= len(words) &lt;= 200</code></li>
<li><code>1 &lt;= len(words[i]) &lt;= 100</code></li>
</ul>