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- #include <iostream>
- using namespace std;
- int f[82][10],n;
- int main(void){
- cin>>n;
- if (n==1){
- cout<<10;
- return 0;
- }
- for (int i=1;i<=9;i++) f[0][i]=1;
- for (int i=1;i<=9;i++) f[i][1]=1;
- for (int i=1;i<=n;i++) for (int j=2;j<=9;j++)
- for(int k=min(i,9);k>=0;k--) f[i][j]+=f[i-k][j-1];
- cout<<f[n][9];
- return 0;
- }
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