Not able pass test 3 and 4(message showing correct)

#1

#include
using namespace std;
int main() {
int n,rem,i,k=0;
cin>>n;
int a[100];
i=0;

while(n!=0)
{
	rem=n%10;
	k++;
	if(9-rem<rem)
	{
		a[i]=9-rem;
		i++;
	}
	else{
	a[i]=rem;
	i++;
	}
	n=n/10;
}
for(i=k-1;i>=k-1;i--)
{
	if(a[i]==0)
	a[i]=9;
}
for(i=k-1;i>=0;i--)
cout<<a[i];

	return 0;

}

#2

Check the constraints in the question.
The number can be up to 10^18 but an array of size greater that 10^5 will give an error. So try to solve this question without using an array. Use long long int data type inplace of int. As int cannot store numbers >10^9

#3

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