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  1. #include <iostream>
  2. #include<math.h>
  3.  
  4. using namespace std;
  5.  
  6. long int fac(int f)
  7. {
  8. 	if(f<2)
  9. 	return 1;
  10.  
  11. 	return(f*fac(f-1));
  12. }
  13.  
  14. long int combinatrics(int n,int r)
  15. {
  16.     return(fac(n)/(fac(n-r)*fac(r)));
  17. }
  18.  
  19. int main() {
  20.  
  21.     int t;
  22.     while(t--)
  23.     {
  24.         int in,out=0;
  25.         cin>>in;
  26.  
  27.         for(int p=0;p<=in;p+=2)
  28.         {
  29.             int s=in-p;
  30.             out=combinatrics(in,s)+(fac(p)/pow(2,p/2))+out;
  31.         }
  32.         cout<<out<<endl;
  33.     }
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 15240KB
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Standard output is empty
https://ideone.com/t4IR9f
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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