Coding Problems Solved Ep.2
This problem was asked by Google.
The power set of a set is the set of all its subsets. Write a function that, given a set, generates its power set.
For example, given the set {1, 2, 3}, it should return {{}, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}}.
You may also use a list or array to represent a set.
ref: https://stackoverflow.com/questions/24365954/how-to-generate-a-power-set-of-a-given-set
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