Problem Statement
There are an integer $N$ and $M$ pairs of integers: $(a_1, b_1), (a_2, b_2), \dots, (a_M, b_M)$. Each pair $(a_i, b_i)$ satisfies $1 \leq a_i \lt b_i \leq N$.
Initally, you have all $N!$ permutations of $(1,2,\dots,N)$.
You will perform $M$ operations. The $i$-th operation is as follows.
- Do the following for each of your
$N!$permutations. - Compare the
$a_i$-th and$b_i$-th elements. If the former is greater, swap the two elements.
For each $1 \leq i \leq M$, let $S_i$ be the number of permutations of yours that are already sorted in ascending order at the end of the $i$-th operation.
Print $S_1, S_2, \dots, S_M$.
Here, the input gives you pairs of integers $(x_i, y_i)$ instead of $(a_i, b_i)$.
The values of $(a_i, b_i)$ can be obtained using $x_i$, $y_i$, and $S_{i-1}$ as follows. (Let $S_0 = 1$ for convenience.)
- Let
$c_i = ((x_i + S_{i-1}) \bmod N) + 1$. - Let
$d_i = ((y_i + S_{i-1} \times 2) \bmod N) + 1$. (Here, it is guaranteed that$c_i \neq d_i$.) - Let
$a_i = \min(c_i, d_i)$. - Let
$b_i = \max(c_i, d_i)$.
Constraints
$2 \leq N \leq 15$$1 \leq M \leq 5 \times 10^5$$1 \leq a_i \lt b_i \leq N$$0 \leq x_i, y_i \leq N - 1$
Input
The input is given from Standard Input in the following format:
N M
x_1 y_1
x_2 y_2
\vdots
x_M y_M
Output
Print $M$ lines. The $i$-th line should contain $S_i$.
样例
2 1
1 1
2
3 4
0 1
2 1
1 1
0 1
2
4
4
6
5 5
4 4
0 4
1 1
2 4
1 2
2
4
4
8
16
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