Computers and Technology, 05.05.2020 05:40, tjmoney8614

The selection algorithm (to find the kth smallest value in a list), described in the class (and in the book), uses columns of size 5. Assume you implement the same selection algorithm using columns of size 9, rather than 5. (a) Exactly how far from either end of the array is the median of medians guaranteed to be. Just give the high order term. (Recall that with columns of size 5 we got 3n 10 .) (b) It turns out that there is an algorithm that finds the median of 9 elements with 14 comparisons. Using this algorithm, briefly list each step of Selection with columns of size 9 and how many comparisons the step takes. Note that partition can now be done with only (4/9)n comparisons; use this value in your analysis. (c) Write a recurrence for the number of comparisons the algorithm uses. (d) Solve the recurrence using constructive induction. Just get the high order term exactly. (e) With more careful analysis, in class we could have obtained 16n comparisons using columns of size 5. How does this new value, using columns of size 9, compare?

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The selection algorithm (to find the kth smallest value in a list), described in the class (and in t...