This is an exercise for the CS guys to shine with the theory.
Imagine you have 2 containers with elements. Folders, URLs, Files, Strings, it really doesn't matter.
What is AN algorithm to calculate the added and the removed?
Notice: If there are many ways to solve this problem, please post one per answer so it can be analysed and voted up.
Edit: All the answers solve the matter with 4 containers. Is it possible to use only the initial 2?
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