Help me optmize

#1

help me optimize
#include
using namespace std;
int main(){
long long int x;
cin>>x;
int i;
long long int dt,ans=0;
long long int pv=1;
for(i=1;x!=0;i++){
dt=x%10;
ans+=min(dt,9-dt)pv;
x/=10;
pv=pv10;
}
pv=1;
for(int j=1;j<=i-2;j++){
pv=pv10;
}
if(ans/pv==0){
ans=ans+9pv;
}
cout<<ans;
return 0;
}

#2

Hello @sakshamngplsn_8a4528baa287a8ff,

Just add a small condition whether dt==9 and x == 0 or not like this:

#include <iostream>

using namespace std;

int main(){

    long long int x;

    cin>>x;

    int i;

    long long int dt,ans=0;

    long long int pv=1;

    for(i=1;x!=0;i++){

        dt=x%10;

        ans+=min(dt,9-dt)*pv;

        x/=10;

        if(x == 0 && dt==9){

            ans += dt*pv;

        }

        pv=pv*10;

    }

    cout<<ans;

    return 0;

}
#3

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