1. // 11题，同模取余
    3. #include <iostream>
    4. using namespace std;
    5. int solve(int t,int n)
    6. {
    7.     if(t==1) return 1;
    8.     else return 5*solve(t-1,n) % n;
    9. }
    10. int main() {
    11.     cout << solve(23,23);
    12. }