Hey there, sorry it took so long to get back to you. Your issue is that you are editing the variable n. The random tests are then taking your solution's n and running it back through the algorithm. Instead of doing this, try duplicating n to some other variable and your solution should work fine. You will have issues with many other solutions if you continue editing the variable passed to you, so I would recommend never doing it.

If you wouldn't mind, could you post your solution here with spoiler tags? I would like to see what you are seeing with the random tests.

Slightly modified, thanks!

Try to avoid sorting.