题库练习 Palindrome Partition
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A11628 | Palindrome Partition

时间限制1s
内存限制256MB
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题目描述

Given a string $s$ , find the number of ways to split $s$ to substrings such that if there are $k$ substrings $(p_{1},p_{2},p_{3},...,p_{k})$ in partition, then $p_{i}=p_{k-i+1}$ for all $i$ $(1<=i<=k)$ and $k$ is even.

Since the number of ways can be large, print it modulo $10^{9}+7$ .

输入格式

The only line of input contains a string $s$ $(2<=|s|<=10^{6})$ of even length consisting of lowercase Latin letters.

输出格式

Print one integer, the number of ways of partitioning the string modulo $10^{9}+7$ .

输入输出样例

输入 #1
abcdcdab
输出 #1
1
输入 #2
abbababababbab
输出 #2
3
C++ 编辑器
输入
输出