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add leetcode problem-cn part1

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算法题（国内版）/problem (Chinese)/最长重复子串 [longest-duplicate-substring].html Normal file
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<p>给你一个字符串 <code>s</code> ，考虑其所有 <em>重复子串</em> ：即&nbsp;<code>s</code> 的（连续）子串，在 <code>s</code> 中出现 2 次或更多次。这些出现之间可能存在重叠。</p>
<p>返回 <strong>任意一个</strong> 可能具有最长长度的重复子串。如果 <code>s</code> 不含重复子串，那么答案为 <code>""</code> 。</p>
<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>s = "banana"
<strong>输出：</strong>"ana"
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>s = "abcd"
<strong>输出：</strong>""
</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>2 &lt;= s.length &lt;= 3 * 10<sup>4</sup></code></li>
<li><code>s</code> 由小写英文字母组成</li>
</ul>