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Suppose the following is a divide-and-conquer algorithm for some problem. "Make the input of size n...

Suppose the following is a divide-and-conquer algorithm for some problem.

"Make the input of size n into 3 subproblems of sizes n/2 , n/4 , n/8 , respectively with O(n) time; Recursively call on these subproblems; and then combine the results in O(n) time.

The recursive call returns when the problems become of size 1 and the time in this case is constant."

(a) Let T(n) denote the worst-case running time of this approach on the problem of size n. Please express the running time with the recurrence.

(b) Use a recursion tree to derive the asymptotic bound of T(n) with "Big Theta" (Θ) notation.

(c) Please use the substitution method to verify the asymptotic bound you derive in (b). (Note: T(n) = Θ (n) , T(n) = O(n) and T(n) = Ω(n).)

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