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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n, k;
  6. 	cin>>n>>k;
  7. 	int dp[k+1][k*9+10]={};
  8. 	for(int i=0; i<=9; i++)
  9. 		dp[1][i]=1;
  10. 	for(int len =2; len<=k; len++){
  11. 		for (int s=0; s<=len*9; s++){
  12. 			for(int i=0; i<=9; i++)
  13. 				dp[len][s+i]+=dp[len-1][s];
  14. 		}
  15. 	}
  16. 	cout<<dp[k][n]<<endl;
  17. 	return 0;
  18. }
Success #stdin #stdout 0.01s 5256KB
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https://ideone.com/B1zZh6
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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