spoj#PSFWORDS. Prefix Square Free Words
Prefix Square Free Words
A string is called a square string if it can be obtained by concatenating two copies of the same string (i.e. $s=uu$ for some word $u$). For example, "abab", "aa" are square strings, while "aaa", "abba" are not. A string is called prefix-square free if none of its prefixes is a square.
Chiaki would like to know the number of nonempty prefix-square free strings whose length is less than or equal to $n$. The size of the alphabet Chiaki uses is $m$. As this number may be very large, Chiaki is only interested in its remainder modulo $2^{32}$.
Input
There are multiple test cases. The first line of input contains an integer $T$ ($1 \le T \le 100$), indicating the number of test cases. For each test case:
The first line contains two integers $n$ and $m$ ($1 \le n \le 100, 1 \le m \le 10^9$) -- the length of the string and the size of the alphabet.
Output
For each test case, output an integer denoting the answer.
Example
Input:
2 3 2 4 6
Output:
8 1266
Information
There are $5$ input files:
- Input #1: $1 \le T \le 100, 1 \le n \le 10$.
- Input #2: $1 \le T \le 50, 1 \le n \le 30$.
- Input #3: $1 \le T \le 30, 1 \le n \le 60$.
- Input #4: $1 \le T \le 10, 1 \le n \le 80$.
- Input #5: $1 \le T \le 2, 1 \le n \le 100$.