Question: What does it mean to have a lower bound for a problem? State clearly what is the lower bound claim for sorting a set of

What does it mean to have a lower bound for a problem? State clearly what is the lower bound claim for sorting a set of n (real)-numbers.

Why does this claim does apply if you are given an array A consisting of n positive integers, where each element is 10n. Devise an algorithm, running in O(n) time, to sort A in ascending order.

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