URAL 1297. Palindrome(输出最长回文子串--后缀数组)

本文介绍了两种高效求解最长回文子串的方法:一种基于后缀数组与RMQ查询,另一种采用Manacher算法。通过实例讲解了每种方法的具体实现步骤及核心代码。

Input

The input consists of a single line, which contains a string of Latin alphabet letters (no other characters will appear in the string). String length will not exceed 1000 characters.

Output

The longest substring with mentioned property. If there are several such strings you should output the first of them.

Sample

input output
ThesampletextthatcouldbereadedthesameinbothordersArozaupalanalapuazorA
ArozaupalanalapuazorA
Problem Author: Eugene Krokhalev
Problem Source: IX Open Collegiate Programming Contest of the High School Pupils (13.03.2004)
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