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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. long long faktorial(long long c) {
  5.     if (c == 0) {
  6.         return 1;
  7.     } else if (c == 1) {
  8.         return 1;
  9.     } else {
  10.         return c * faktorial(c - 1);
  11.     }
  12. }
  13.  
  14. long long permutasi (long long a, long long b) {
  15.     return faktorial(a) / faktorial(a - b);
  16. }
  17.  
  18. int main() {
  19.     long long n; long long r;
  20.     cin >> n >> r;
  21.     cout << permutasi(n, r);
  22. }
Success #stdin #stdout 0s 5316KB
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39916800
https://ideone.com/mJThKi
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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