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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. long long dp[51];
  5.  
  6. long long f(int a){
  7. 	long long temp = 0;
  8.  
  9. 	if(a == 0){
  10. 		return 1;
  11. 	}
  12.  
  13. 	if(a == 1){
  14. 		return 0;
  15. 	}
  16.  
  17. 	if (dp[a] == -1) {
  18. 		for (int i = 2; i <= a; i++ ){
  19. 			temp += f(i - 2) * f(a - i);
  20. 		}
  21. 		dp[a] = temp;
  22. 	}
  23. 	return dp[a];
  24. }
  25.  
  26. int main() {
  27. 	memset(dp, -1, sizeof dp);
  28. 	int x;
  29. 	cin >> x;
  30. 	long long result;
  31. 	result = f(x);
  32. 	cout << result;
  33. }
Success #stdin #stdout 0.01s 5300KB
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https://ideone.com/KOAsf4
language:
C++ (gcc 8.3)
created:
14 days ago
visibility:
public

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