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  1. #include<iostream>
  2. using namespace std;
  3. int fact(int n)
  4. {
  5.     if(n==1)
  6.         return 1;
  7.     return fact(n-1);
  8. }
  9. int main()
  10. {
  11.     int Testnum, N, M;
  12.     cin>>Testnum;
  13.     for(int i=0; i<Testnum; i++)
  14.     {
  15.         cin>>N>>M;
  16.         cout<<fact(M)/fact(N)*fact(M-N);  
  17.     }
  18.     return 0;
  19. }
Success #stdin #stdout 0s 4824KB
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3
2 2
1 5
13 29
stdout
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111
https://ideone.com/Gry1U3
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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