Codeforces Round 334 (Div. 1)
B
Moodular Arithmetic
Codeforces
1800
原题
← AC →
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As behooves any intelligent schoolboy, Kevin Sun is studying psycowlogy, cowculus, and cryptcowgraphy at the Bovinia State University (BGU) under Farmer Ivan. During his Mathematics of Olympiads (MoO) class, Kevin was confronted with a weird functional equation and needs your help. For two fixed integers $*k*$ and $*p*$, where $*p*$ is an odd prime number, the functional equation states that

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image

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for some function image. (This equation should hold for any integer $*x*$ in the range $0$ to $*p* - 1$, inclusive.)

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It turns out that $*f*$ can actually be many different functions. Instead of finding a solution, Kevin wants you to count the number of distinct functions $*f*$ that satisfy this equation. Since the answer may be very large, you should print your result modulo $10^{9} + 7$.

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Input

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The input consists of two space-separated integers $*p*$ and $*k*$ ($3 ≤ *p* ≤ 1 000 000$, $0 ≤ *k* ≤ *p* - 1$) on a single line. It is guaranteed that $*p*$ is an odd prime number.

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Output

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Print a single integer, the number of distinct functions $*f*$ modulo $10^{9} + 7$.

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Note

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In the first sample, $*p* = 3$ and $*k* = 2$. The following functions work:

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  1. $*f*(0) = 0$, $*f*(1) = 1$, $*f*(2) = 2$.
  2. $*f*(0) = 0$, $*f*(1) = 2$, $*f*(2) = 1$.
  3. $*f*(0) = *f*(1) = *f*(2) = 0$.
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样例

Input #1
3 2
Output #1
3
InputCopy OutputCopy
Input #2
5 4
Output #2
25
InputCopy OutputCopy
题目信息
题号
603B
时间限制
1 s
内存限制
256 MB
标签
组合数学
DFS 及类似
并查集
数学
数论

题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。