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  1. #include <iostream>
  2.  
  3. using namespace std;
  4. __int128_t n;
  5.  
  6. __int128_t pow(__int128_t a, __int128_t b) {
  7.     __int128_t res = 1;
  8.     while (b)
  9.         if (b % 2) {
  10.             res = (res * a) % n;
  11.             b--;
  12.         } else {
  13.             a = (a * a) % n;
  14.             b = b / 2;
  15.         }
  16.     return res;
  17. }
  18.  
  19. __int128_t f(__int128_t x, __int128_t m) {
  20.     if (m == 0) return 1;
  21.     else if (m % 2) return f(x, m / 2) * (pow(x, (m + 1) / 2) + 1) % n;
  22.     else return (f(x, m - 1) + pow(x, m)) % n;
  23. }
  24.  
  25. int main() {
  26.     int counter;
  27.     cin >> counter;
  28.     for (int c = 0; c < counter; ++c) {
  29.         size_t x, m, nn;
  30.         cin >> x >> m >> nn;
  31.         n = __int128_t(nn);
  32.         cout << (size_t) f(__int128_t(x), __int128_t(m)) << "\n";
  33.     }
  34. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/y857Ra
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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