what are vp-trees and a bit more info regarding vp-trees required!

I've been given a project in data structures/OOP to make a program in C++ that notes the entry/exit time of the employers of a company and if a specific employer exits before the specified time, a percentage of his/her salary will be deducted accordingly.... but I HAVE NO IDEA WHAT A VP-TREE ACTUALLY IS, AND HOW TO IMPLEMENT IT IN SUCH KIND OF A PROGRAM.... can somebody please help? Any kind of help will be highly appreciated.
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