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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. const long m = 1e9 + 7;
  6.  
  7. inline long fastModExpo(long a, long b) {
  8.     long y = 1;
  9.     while (b) {
  10.         if (b & 1) {
  11.             y *= a;
  12.             y %= m;
  13.         }
  14.         b >>= 1;
  15.         a *= a;
  16.         a %= m;
  17.     }
  18.     return y;
  19. }
  20.  
  21. int main() {
  22.     ios_base::sync_with_stdio(false);
  23.     cin.tie(nullptr);
  24.     cout.tie(nullptr);
  25.     int tt;
  26.     cin >> tt;
  27.     while (tt--) {
  28.         long n, s;
  29.         cin >> n >> s;
  30.         long ans = fastModExpo(n, m - 2);
  31.         ans *= s;
  32.         ans %= m;
  33.         ans = fastModExpo(ans, n);
  34.         cout << ans << '\n';
  35.     }
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0s 15232KB
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https://ideone.com/BdT49L
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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