[anttihaapala]

This is not a complicated algorithm. A hash map (dictionary) or a hash set is how you would always do deduplication in Python, because it is easiest to write / least keystrokes anyway. That is not the case in C though, as it is much easier to use arrays and nested loops instead of hash maps.

[throwaway2037]

    > That is not the case in C though, as it is much easier to use arrays and nested loops instead of hash maps.

I am confused. There are plenty of open source, fast hash map impls in C.

[saagarjha]

Yes, the problem is getting them into your project.

[account42]

That's only a problem if you have never done any C development.