okay , thank you !

There are no fancy optimizations required, but still the most trivial solutions might time out. Try to find a solution which does not loop all the way up to n.

Maybe the tests weren't strict at the time this solution passed them or they got lucky with the random tests. Sometimes the solutions aren't revalidated and some of them won't pass the tests anymore but they still show in Solutions tab.

i did same , but it showed timeout !

I am struggling with exactly the same issue, but in Python.

I amended my code to maintain the size sum of all inserted blobs, and it does indeed come up to 570, which means that the fixed tests are correct, and that there is a bug in both of our codebases.

That's all I know for now.

It is important to consider the case when i and n/i are both square root of n.