题目描述

In mathematics, the dihedral group $D_n$ is the group of symmetries of a regular $n$-gon. Rotations and reflections are elements of $D_n$, and in fact all elements of the dihedral group can be expressed as a series of rotations and reflections. Elements of $D_n$ act on the $n$-gon by permuting its vertices. For example, consider a regular pentagon with vertices initially labeled $1, 3, 5, 4, 2$ (clockwise, starting from the top):

:::align{center} :::

Applying the above three dihedral actions to the pentagon (a rotation, reflection, and then another rotation) produces the following relabelings of the pentagon’s vertices:

$$1, 3, 5, 4, 2 \rightarrow 2, 1, 3, 5, 4 \rightarrow 2, 4, 5, 3, 1 \rightarrow 1, 2, 4, 5, 3.$$

You are given an arbitrary clockwise labeling of the vertices of a regular $n$-gon using the integers $1$ through $n$, and a second sequence to test. Determine whether it’s possible to apply some series of dihedral actions to the $n$-gon so that the test sequence appears as a contiguous clockwise sequence of vertex labels on the transformed polygon.

输入格式

The first line of input has two integers $n$ and $m$, ($1 \le m \le n \le 5 \cdot 10^4$) where $n$ is the number of vertices of the polygon and $m$ is the length of the sequence to be tested.

The next line contains $n$ space-separated integers $d$ ($1 \le d \le n$). This is the initial labeling of the polygon vertices. It is guaranteed that each integer from $1$ to $n$ appears exactly once.

The next line contains $m$ space-separated integers $t$ ($1 \le t \le n$). This is the sequence to be tested.

输出格式

Output a single integer, which is $1$ if the test sequence could appear as a contiguous sequence of vertex labels after applying some series of dihedral actions to the initial polygon, and $0$ otherwise.

3 3
1 2 3
1 3 2

1

3 1
1 2 3
1

1

4 2
1 2 3 4
1 3

0

4 4
1 2 3 4
2 3 4 1

1

4 4
1 2 3 4
3 2 1 4

1

5 3
1 3 5 4 2
2 1 3

1

5 4
1 3 5 4 2
2 1 5 3

0