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add leetcode problem-cn part6

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小墨
2022-03-27 20:56:26 +08:00
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算法题（国内版）/problem (Chinese)/最长回文串 [longest-palindrome].html Normal file
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<p>给定一个包含大写字母和小写字母的字符串<meta charset="UTF-8" />&nbsp;<code>s</code>&nbsp;，返回&nbsp;<em>通过这些字母构造成的 <strong>最长的回文串</strong></em>&nbsp;。</p>
<p>在构造过程中，请注意 <strong>区分大小写</strong> 。比如&nbsp;<code>"Aa"</code>&nbsp;不能当做一个回文字符串。</p>
<p>&nbsp;</p>
<p><strong>示例 1: </strong></p>
<pre>
<strong>输入:</strong>s = "abccccdd"
<strong>输出:</strong>7
<strong>解释:</strong>
我们可以构造的最长的回文串是"dccaccd", 它的长度是 7。
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong>s = "a"
<strong>输入:</strong>1
</pre>
<p><strong>示例 3:</strong></p>
<pre>
<strong>输入:</strong>s = "bb"
<strong>输入:</strong> 2
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= s.length &lt;= 2000</code></li>
<li><code>s</code>&nbsp;只能由小写和/或大写英文字母组成</li>
</ul>