BZOJ 3884 欧拉定理 无穷幂取模

Posted on 2016-09-19 23:55  yyjxx2010xyu  阅读(173)  评论(0编辑  收藏  举报

详见PoPoQQQ的博客..

 1  
 2 #include <iostream>
 3 #include <cstring>
 4 #include <cstdio>
 5 #include <algorithm>
 6 #define LL long long
 7 using namespace std;
 8 LL KASE,p;
 9 inline LL Get_Phi(LL x)
10 {
11     LL Ret=x;
12     for (LL i=2;i*i<=x;i++)
13         if (x%i==0)
14         {
15             Ret/=i;Ret*=(i-1);
16             while (x%i==0) x/=i;
17         }
18     if (x>1) Ret/=x,Ret*=(x-1);
19     return Ret;
20 }
21 inline LL Pow(LL Base,LL Exp,LL Mod)
22 {
23     LL Ret=1;
24     while (Exp)
25     {
26         if (Exp&1) Ret=(Ret*Base)%Mod;
27         Exp>>=1; Base=(Base*Base)%Mod; 
28     }
29     return Ret;
30 }
31 LL Solve(LL p)
32 {
33     if (p==1) return 0;
34     LL Exp=0;
35     while (!(p&1)) p>>=1,Exp++;
36     LL Phi=Get_Phi(p);
37     LL Tmp=Solve(Phi);
38     (Tmp+=Phi-Exp%Phi)%=Phi;
39     Tmp=Pow(2,Tmp,p)%p;
40     return Tmp<<Exp;
41      
42 }
43 int main()
44 {
45     scanf("%lld",&KASE);
46     for (LL Kase=1;Kase<=KASE;Kase++)
47     {
48         scanf("%lld",&p);
49         printf("%lld\n",Solve(p));
50     }
51     return 0;
52 }
C++