The selection algorithm (to find thekth smallest value in a list), described in the class(and in the book), uses columns of size 5. Assume that you implement the same selectionalgorithm using columns of size 17, rather than 5. Required:
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 in.)
b. It turns out that there is an algorithm that finds the median of 9 elements with 14 com- parisons. 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?