midterm_review

# midterm_review - 1 Order the following running time bounds...

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1. Order the following running time θ bounds by asymptotic growth rate in nondescending order. Indicate equality, if any. N 2 , 2 N , 25, Nlg(lgN), Nlg(N 2 ), N 2 lgN, N 3 , NlgN, and N! . 2. Solve the following recurrences by obtaining a θ bound for T(N) given that T(1) = θ(1) : a. T(N) = 2N - 1 + T(N-1) b. T(N) = N + T(N-3) c. T(N) = N 2 + T(N-1) 3. Perform a worst-case analysis of each of the following fragments and give a θ bound for the running time: a. sum = 0; for (int i = 0; i < N; i++) for (int j = 0; j < i * i; j++) for (int k = 0; k < j; k++) sum++; b. sum = 0; for (int i = 0; i < N; i++) for (int j = 0; j < i * i; j++) if (j % i == 0) { for (int k = 0; k < j; k++) sum++; } The sums on page #5 of the text may help. 4. Mergesort does have a worst-case time of θ(NlgN) but its overhead (hidden in the constant factors) is high and this is manifested near the bottom of the recursion tree where many merges are made. Someone proposed that we stop the recursion once the size reaches

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midterm_review - 1 Order the following running time bounds...

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