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Design an algorithm that takes in a stream z1, . . . , zM of M integers in [n] and at any time t can output a uniformly random element in z1, . . . , zt . Your algorithm may use at most polynomial in log n and log M space. Prove the correctness and analyze the space complexity of your algorithm. Y

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Design an algorithm that takes in a stream z1, . . . , zM of M integers in [n] and at any time t can...
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