Jf1JuT.json

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        "question": {
            "questionId": "1000312",
            "questionFrontendId": "剑指 Offer II 114",
            "categoryTitle": "LCOF2",
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            "title": "外星文字典",
            "titleSlug": "Jf1JuT",
            "content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
            "translatedTitle": "外星文字典",
            "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>&quot;&quot;</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&nbsp;<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 &lt; t.length</code> 时，<code>s</code> 的字典顺序也小于 <code>t</code> 。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [&quot;wrt&quot;,&quot;wrf&quot;,&quot;er&quot;,&quot;ett&quot;,&quot;rftt&quot;]\n<strong>输出：</strong>&quot;wertf&quot;\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [&quot;z&quot;,&quot;x&quot;]\n<strong>输出：</strong>&quot;zx&quot;\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>words = [&quot;z&quot;,&quot;x&quot;,&quot;z&quot;]\n<strong>输出：</strong>&quot;&quot;\n<strong>解释：</strong>不存在合法字母顺序，因此返回 <code>&quot;&quot; 。</code>\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= words.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= words[i].length &lt;= 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>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意：本题与主站 269&nbsp;题相同：&nbsp;<a href=\"https://leetcode-cn.com/problems/alien-dictionary/\">https://leetcode-cn.com/problems/alien-dictionary/</a></p>\n",
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