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leetcode-problemset/leetcode-cn/problem (Chinese)/最长回文子序列 [longest-palindromic-subsequence].html
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<p>给你一个字符串 <code>s</code> ,找出其中最长的回文子序列,并返回该序列的长度。</p>
<p>子序列定义为:不改变剩余字符顺序的情况下,删除某些字符或者不删除任何字符形成的一个序列。</p>
<p> </p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>s = "bbbab"
<strong>输出:</strong>4
<strong>解释:</strong>一个可能的最长回文子序列为 "bbbb" 。
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>s = "cbbd"
<strong>输出:</strong>2
<strong>解释:</strong>一个可能的最长回文子序列为 "bb" 。
</pre>
<p> </p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 <= s.length <= 1000</code></li>
<li><code>s</code> 仅由小写英文字母组成</li>
</ul>