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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. long double silnia(int n)
  6. {
  7.    if (n==0) return 1;
  8.    else return n*silnia(n-1);
  9. }
  10.  
  11. int ile, a,b,c;
  12. long double x,y,z,d;
  13.  
  14. int main()
  15. {
  16.     cin >> ile;
  17.     for (int i=1; i<=ile; i++)
  18.     {
  19.         cin >> a >> b;
  20.         c=a-b;
  21.         x=silnia(a);
  22.         y=silnia(b);
  23.         z=silnia(c);
  24.  
  25.         d=x/(z*y);
  26.  
  27.         cout << d << endl;
  28.     }
  29.  
  30.   return 0;
  31. }
Success #stdin #stdout 0s 3416KB
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stdin
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3
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7 3
1000 2
stdout
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1
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https://ideone.com/hLFf4W
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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