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- #include <iostream>
- using namespace std;
- long long v[1000000][10];
- int main()
- {
- int n,i,j;
- cin>>n;
- for(i=1;i<=9;i++){
- v[1][i]=1;
- }
- for(i=2;i<=n;i++){
- for(j=1;j<=9;j++){
- if(j-1>0){
- v[i][j-1]=(v[i][j-1]+v[i-1][j])%998244353;
- }
- if(j+1<10){
- v[i][j+1]=(v[i][j+1]+v[i-1][j])%998244353;
- }
- v[i][j]+=v[i-1][j];
- v[i][j]%=998244353;
- }
- }
- long long s=0;
- for(i=1;i<10;i++){
- s=(s+v[n][i])%998244353;
- }
- cout<<s;
- return 0;
- }
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