I solved this problem using both sorting and a set; but the sorting solution passes but the set solution TLEs. I'm curious if this is by design since the problem is marked under "sorting" or if hashing is just that much slower in this case.

problem: https://cses.fi/problemset/task/1621/

my code: https://cses.fi/paste/e9ace6fc0fc91742778f0f/