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  1. #include<iostream>
  2. using namespace std;
  3. int d[100][10];
  4. int main(){
  5.     int n;
  6.     cin>>n;
  7.     d[0][0]=0;
  8.     for(int i=1;i<10;i++){
  9.         d[0][i]=1;
  10.     }
  11.     for(int i=1;i<=n;i++){
  12.         for(int j=0;j<10;j++){
  13.             if(j==0) d[i][j]=d[i-1][j+1]%1000000000;
  14.             if(j==9) d[i][j]=d[i-1][j-1]%1000000000;
  15.             d[i][j]=(d[i-1][j-1]%1000000000+d[i-1][j+1]%1000000000)%1000000000;
  16.         }
  17.     }
  18.     int ans=0;
  19.     for(int i=0;i<10;i++){
  20.         ans+=d[n][i]%1000000000;
  21.     }
  22.     cout<<ans;
  23.     return 0;
  24. }
Success #stdin #stdout 0s 4544KB
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https://ideone.com/g6j84t
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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