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- #include<iostream>
- using namespace std;
- int Dp[1005][2];
- int main()
- {
- int n,a,b;
- cin>>n>>a>>b;
- Dp[1][0]=9;
- if(a!=0)
- Dp[1][0]--;
- if(b!=0)
- Dp[1][0]--;
- if(a!=0)
- Dp[1][1]=1;
- else
- Dp[1][1]=0;
- for(int i=2; i<=n; i++)
- {
- Dp[i][0]=8*Dp[i-1][0];
- Dp[i][1]=Dp[i-1][0]+9*Dp[i-1][1];
- }
- cout<<Dp[n][1]<<"\n";
- return 0;
- }
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