BZOJ 3884 欧拉定理 无穷幂取模

详见PoPoQQQ的博客..

 #include <iostream>
 #include <cstring>
 #include <cstdio>
 #include <algorithm>
 #define LL long long
 using namespace std;
 LL KASE,p;
 inline LL Get_Phi(LL x)
 {
     LL Ret=x;
     for (LL i=;i*i<=x;i++)
         if (x%i==)
         {
             Ret/=i;Ret*=(i-);
             while (x%i==) x/=i;
         }
     if (x>) Ret/=x,Ret*=(x-);
     return Ret;
 }
 inline LL Pow(LL Base,LL Exp,LL Mod)
 {
     LL Ret=;
     while (Exp)
     {
         if (Exp&) Ret=(Ret*Base)%Mod;
         Exp>>=; Base=(Base*Base)%Mod;
     }
     return Ret;
 }
 LL Solve(LL p)
 {
     if (p==) return ;
     LL Exp=;
     while (!(p&)) p>>=,Exp++;
     LL Phi=Get_Phi(p);
     LL Tmp=Solve(Phi);
     (Tmp+=Phi-Exp%Phi)%=Phi;
     Tmp=Pow(,Tmp,p)%p;
     return Tmp<<Exp;

 }
 int main()
 {
     scanf("%lld",&KASE);
     for (LL Kase=;Kase<=KASE;Kase++)
     {
         scanf("%lld",&p);
         printf("%lld\n",Solve(p));
     }
     return ;
 }

C++