for converting one string into another.

4.1. 最长回文串 LeetCode: 给定一个包含大写字母和小写字母的字符串，找到通过这些字母构造成的最长的回文串。在构造过程中，请注意区分大小写。比如 "Aa" 不能当做一个回文字符串。注 意:假设字符串的长度不会超过 1010。

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