Chewbacca and Number first two test cases not passed

#1

The first two test cases are not being passed by my program. I saw the solution given by sir and I understand that too but I want to know why my program can not pass the test cases .Whatever input I give by myself, I am getting the correct output for that. Please look into my program and help me
#include
using namespace std;
int main() {
unsigned long long int n,num,sum=0;
//unsigned long long A[100000]={0};
cin>>n;
if(n> 100000000000000000)
return 0;
num=n;
int first_variable_check_if_zero=0;
int k=0,p=1,store=0;
while(num>=1)
{
int remainders=num%10;
int quotient=num/10;
int minusNine=9-remainders;
first_variable_check_if_zero=remainders;
if(minusNine<remainders)
{
store=minusNine;
}
else
store=remainders;
if(quotient==0 && store==0)
store=remainders;
sum+=(pstore);
p=10;
k++;
num/=10;
}
cout<<sum;
return 0;
}

#2

Check for the input

9864839

correct output should be

9134139

#3

No, correct output should be 9134130. Wasted alot of time finding where I am wrong.

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