longest-palindrome

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Algorithms

Given a string <code>s</code> which consists of lowercase or uppercase letters, return the length of the longest palindrome&nbsp;that can be built with those letters.

Letters are case sensitive, for example, <code>&quot;Aa&quot;</code> is not considered a palindrome.

&nbsp;
Example 1:

<pre>
Input: s = &quot;abccccdd&quot;
Output: 7
Explanation: One longest palindrome that can be built is &quot;dccaccd&quot;, whose length is 7.
</pre>

Example 2:

<pre>
Input: s = &quot;a&quot;
Output: 1
Explanation: The longest palindrome that can be built is &quot;a&quot;, whose length is 1.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= s.length &lt;= 2000</code></li>
	<li><code>s</code> consists of lowercase and/or uppercase English&nbsp;letters only.</li>
</ul>

longestPalindrome

Longest Palindrome

Palindrome Permutation

palindrome-permutation

回文排列

Longest Palindrome by Concatenating Two Letter Words

longest-palindrome-by-concatenating-two-letter-words

连接两字母单词得到的最长回文串

Largest Palindromic Number

largest-palindromic-number

最大回文数字

Greedy

Hash Table

String

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;通过这些字母构造成的 最长的 回文串&nbsp;的长度。

在构造过程中，请注意 区分大小写 。比如&nbsp;<code>"Aa"</code>&nbsp;不能当做一个回文字符串。

&nbsp;

示例 1: 

<pre>
输入:s = "abccccdd"
输出:7
解释:
我们可以构造的最长的回文串是"dccaccd", 它的长度是 7。
</pre>

示例 2:

<pre>
输入:s = "a"
输出:1
解释：可以构造的最长回文串是"a"，它的长度是 1。
</pre>

&nbsp;

提示:

<ul>
	<li><code>1 &lt;= s.length &lt;= 2000</code></li>
	<li><code>s</code>&nbsp;只由小写 和/或 大写英文字母组成</li>
</ul>