1497 取余运算

 1 #include<iostream>
 2 using namespace std;
 3 int tot;
 4 int b,p,k;
 5 int f(int p)
 6 {
 7     if(p==0)return 1;
 8     int t=f(p/2)%k;
 9     t=(t*t)%k;
10     if(p%2==1)
11     t=(t*b)%k;
12     return t;
13 }
14 int main()
15 {
16     
17     cin>>b>>p>>k;
18     int o=b;
19     b%=k;
20     cout<<o<<"^"<<p<<" mod "<<k<<"="<<f(p);
21     return 0;
22 }