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  1. #include <iostream>
  2. using namespace std;
  3. int dp[12][10];
  4. int main() {
  5. 	int n;
  6. 	cin>>n;
  7. 	for(int i=1; i<=9; i++)
  8. 		dp[1][i]=1;
  9. 	for(int len=2; len<=n; len++){
  10. 		for(int val=0; val<=9; val++){
  11. 			if(val<9)dp[len][val]+=dp[len-1][val+1];
  12. 			if(val>0)dp[len][val]+=dp[len-1][val-1];
  13. 			dp[len][val]+=dp[len-1][val];
  14.  
  15.  
  16. 		}
  17. 	}
  18. 	int ans=0;
  19. 	for(int i=0; i<=9; i++)
  20. 		ans+=dp[n][i];
  21. 	cout<<ans<<endl;
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 5308KB
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https://ideone.com/WrjgfR
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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