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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  long long n,k;
  4. int main(){
  5. 	cin >> n >> k;
  6. 	if (k == 0){
  7. 		cout << n;
  8. 		return 0;
  9. 	}
  10. 	unsigned long long mau = pow(10,9) + 7;
  11. 	unsigned long long t = 2*k + 1;
  12. 	unsigned long long A[t];
  13. 	A[0] = 1;
  14. 	A[1] = 1;
  15. 	for (unsigned long long i = 2; i < t; i++){
  16. 		A[i] = (A[i - 1] + A[i - 2]) % mau;
  17. 	}
  18. 	cout << (A[t - 1] * n) % mau;
  19. }
  20.  
Success #stdin #stdout 0.01s 5328KB
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stdin
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940 91009
stdout
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756585364
https://ideone.com/ZK8BQJ
language:
C++14 (gcc 8.3)
created:
13 hours ago
visibility:
public

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