fork(1) download
copy 
  1. #include <iostream>
  2. #define max 1000000007
  3. using namespace std;
  4.  
  5. int schemes(int n) {
  6. 	int a[n+1];
  7. 	a[1]=0;a[2]=12;
  8. 	for(int i=3;i<=(max-7);++i) {
  9. 		a[i]=(2*a[i-1])%max+(3*a[i-2])%max;
  10. 		a[i]%=max;
  11. 	}
  12. 	return a[n];
  13. }
  14.  
  15. int main() {
  16. 	ios::sync_with_stdio(false);
  17. 	int t,n;
  18. 	cin>>t;
  19. 	while(t--) {
  20. 		cin>>n;
  21. 		cout<<schemes(n)<<endl;
  22. 	}
  23. 	return 0;
  24. }
Runtime error #stdin #stdout 0s 3476KB
comments (?)
stdin
copy 
3
2
3
5
stdout
copy 
Standard output is empty
https://ideone.com/ArL9k1
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!