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  1. // to fill a 3xn board with 2x1 dominoes.
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. int countWays(int n)
  6. {
  7. 	int A[n + 1], B[n + 1];
  8. 	A[2] = 3, A[1] = 0, B[2] = 1, B[1] = 0;
  9. 	for (int i = 3; i <= n; i++) {
  10. B[i] = A[i-2] + B[i-2];
  11. 		A[i] = A[i - 2] + 2 * B[i];
  12.  
  13. 	}
  14.  
  15. 	return A[n];
  16. }
  17.  
  18. int main()
  19. {
  20. 	int n = 4;
  21. 	cout << countWays(n);
  22. 	return 0;
  23. }
Success #stdin #stdout 0.01s 5532KB
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https://ideone.com/dlzUsR
language:
C++ (gcc 8.3)
created:
317 days ago
visibility:
public

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