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27 lines
693 B
HTML
27 lines
693 B
HTML
<p>给定一个字符串 <em><strong>s</strong></em>，你可以通过在字符串前面添加字符将其转换为<span data-keyword="palindrome-string">回文串</span>。找到并返回可以用这种方式转换的最短回文串。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>s = "aacecaaa"
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<strong>输出：</strong>"aaacecaaa"
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>s = "abcd"
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<strong>输出：</strong>"dcbabcd"
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= s.length <= 5 * 10<sup>4</sup></code></li>
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<li><code>s</code> 仅由小写英文字母组成</li>
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</ul>
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