Hey, not sure where to ask this but can we get an update to the Ocaml compiler version?

Currently codeforces uses the version 4.02 which is ~10 years outdated at this point. The latest version is 5.2.1 but a bump to any 5.0+ version would be great.

I really enjoy using codeforces to learn new languages but this time I'm having a tough time since almost everything from the stdlib I try to use gives me a compilation error :(

Given a NxN grid, you need to choose one element in each row and every element must be in a distinct column (Like placing N rooks in a NxN grid).

Print the elements you chose in each row such that they have maximum possible sum. (Any possible answer is accepted) $$$1 \leq N \leq 100$$$

$$$1 \leq A_{i,j} \leq 100$$$

Example input:

3
1 10 12
13 5 15
20 2 5

Example output:

2 3 1

Preferably i want to solve the problem when the size of elements doesn't really matter (Say, $$$A_{i,j} \leq 10^9$$$).