Question: C++ Question: A perfect hash function is one that never generates any collisions. Is it possible to create such a function? If so, what conditions

C++ Question:

A perfect hash function is one that never generates any collisions. Is it possible to create such a function? If so, what conditions would need to be true for one to exist? How would you go about finding such a function? If such a function cannot be created, why not?

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