Chewbacca and number

Test case 2 and 3 failed. It runs fine for 99,100,etc.
#include
using namespace std;
int main() {
long long int x;
cin >> x;
if(x<1 or x>1000000000000000000)
return 0;
int y=0;
int rem,i=1;
for(;x>= 10; x= x/10)
{
rem = x%10;
if(rem >= 5 )
rem = 9-rem;
y = y+ remi;
i=i
10;
}
rem = x%10;
if(rem >=5 && rem !=9)
rem = 9-rem;
y += rem *i;
cout << y << endl;
return 0;
}

Hi. pls save ur code on (https://ide.codingblocks.com/) and send link

image
just use long long int here. rest ur code is perfect,
I have made changes in ur code https://ide.codingblocks.com/s/582294
Hope it clears all ur doubts

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