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"translatedContent": "<p>现有一种使用英语字母的外星文语言,这门语言的字母顺序与英语顺序不同。</p>\n\n<p>给定一个字符串列表 <code>words</code> ,作为这门语言的词典,<code>words</code> 中的字符串已经 <strong>按这门新语言的字母顺序进行了排序</strong> 。</p>\n\n<p>请你根据该词典还原出此语言中已知的字母顺序,并 <strong>按字母递增顺序</strong> 排列。若不存在合法字母顺序,返回 <code>""</code> 。若存在多种可能的合法字母顺序,返回其中 <strong>任意一种</strong> 顺序即可。</p>\n\n<p>字符串 <code>s</code> <strong>字典顺序小于</strong> 字符串 <code>t</code> 有两种情况:</p>\n\n<ul>\n\t<li>在第一个不同字母处,如果 <code>s</code> 中的字母在这门外星语言的字母顺序中位于 <code>t</code> 中字母之前,那么 <code>s</code> 的字典顺序小于 <code>t</code> 。</li>\n\t<li>如果前面 <code>min(s.length, t.length)</code> 字母都相同,那么 <code>s.length < t.length</code> 时,<code>s</code> 的字典顺序也小于 <code>t</code> 。</li>\n</ul>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>words = ["wrt","wrf","er","ett","rftt"]\n<strong>输出:</strong>"wertf"\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>words = ["z","x"]\n<strong>输出:</strong>"zx"\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong>words = ["z","x","z"]\n<strong>输出:</strong>""\n<strong>解释:</strong>不存在合法字母顺序,因此返回 <code>"" 。</code>\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= words.length <= 100</code></li>\n\t<li><code>1 <= words[i].length <= 100</code></li>\n\t<li><code>words[i]</code> 仅由小写英文字母组成</li>\n</ul>\n\n<p> </p>\n\n<p><meta charset=\"UTF-8\" />注意:本题与主站 269 题相同: <a href=\"https://leetcode-cn.com/problems/alien-dictionary/\">https://leetcode-cn.com/problems/alien-dictionary/</a></p>\n",
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