Palindromic Subsequence
题目描述
[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=26&page=show_problem&problem=2399
[PDF](https://uva.onlinejudge.org/external/114/p11404.pdf)
![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11404/5a2f90597be3614b65fba8ea886ef3720ad90e24.png)
输入输出格式
输入格式
![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11404/5d529bca5a84ba4c913ad766ed8b0f427f7ca32d.png)
输出格式
![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11404/dfe827b1e9174c45126a7e12ff91c03e886b8913.png)
输入输出样例
输入样例 #1
aabbaabb
computer
abzla
samhita
输出样例 #1
aabbaa
c
aba
aha