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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. long long arr[61] = {0};
  5.  
  6. long long num_of_ways(int n){
  7. 	if(arr[n]) {
  8. 		return arr[n];
  9. 	}
  10. 	else {
  11. 		arr[n] = num_of_ways(n-1) + num_of_ways(n-2) + num_of_ways(n-3);
  12. 	}
  13. 	return arr[n];
  14. }
  15. int main() {
  16. 	int n;
  17. 	cin >> n;
  18. 	arr[0] = 1;
  19. 	arr[1] = 1;
  20. 	arr[2] = 2;
  21. 	cout << num_of_ways(n);
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 4548KB
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4680045560037375
https://ideone.com/1fLLHy
тоже запоминание
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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