Given a pseudo-random generator which produces a uniform distribution from the range 0..2^32-1, build a generator which produces discrete samples from the integers 0..N-1 according to a user-specified probability distribution {P0, P1, P2, ... PN-1} (where Px is the probability of x being generated on any draw). Initialization of the generator may be of time complexity O(N) and the generator may have memory use of O(N), but each draw must be constant time O(1).
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