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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. void count(int n){
  5. 	int dp[n+1];
  6. 	dp[0] = 0;
  7. 	dp[1] = 1;
  8. 	dp[2] = 2;
  9. 	dp[3] = 4;
  10. 	for(int i=4;i<=n;i++){
  11. 		dp[i] = dp[i-1]+dp[i-2]+dp[i-3];
  12. 	}
  13. 	cout<<dp[n];
  14. }
  15.  
  16. int main() {
  17. 	int n;
  18. 	cin>>n;
  19. 	count(n);
  20. 	// your code goes here
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 4224KB
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stdin
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4
stdout
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7
https://ideone.com/pwh8dD
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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