Yes. Hash table, linked list and a graph of some sort are those fundamental datastructures that everyone should have implemented at least once by themselves. IM

Yes. Hash table, linked list and a graph of some sort are those fundamental datastructures that everyone should have implemented at least once by themselves. IMO, the core to excellent software engineering his having a lucid intuition about fundamental things such as those. Mainly because they are simple, and lot of problems are solvable by using them without resorting to Someone Elses Gigantic Platform Framework.