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HW03 Solution
Please read the instructions carefully. You have to use the companion answer sheet (which is a llable PDF le) to type/select your answers to the questions described here. Hand-written assignment (or photo of it) will not be graded. Submit the lled PDF le of the answer sheet on Gradescope, following the link on Canvas. You should name your le using the format CSE310-HW03-LastName-FirstName.pdf. Make sure that your submission can be viewed clearly on gradescope for auto-grading. Adobe Acrobat Reader can be found at https://get.adobe.com/reader/.
Q1 (15 points) A max-heap with capacity 20 and size 10 is shown in the following array format. The following three sub-questions all refer to this max-heap (not the heap you obtained after doing some operations).
i
1
2
3
4
5
6
7
8
9
10
A[i]
29
27
25
23
21
19
17
15
13
11
(a) On the answer sheet, show the result after applying heap-extract-max(A) to the max-heap at the start of this question.
(b) On the answer sheet, show the result after applying heap-increase-key(A, 10, 28) to the max-heap at the start of this question.
(c) On the answer sheet, show the result after applying max-heap-insert(A, 29) to the max-heap at the start of this question.
Q2 (15 points) In class, we have studied max-heap and its operations in details. The min-heap data structure is de ned similarly, with max replaced by min, greater than replaced by less than, etc. The operations of min-heap is also symmetric to the corresponding operations of the max-heap. This question is about the min-heap. A min-heap with capacity 20 and size 10 is shown in the following array format. The following three sub-questions all refer to this min-heap (not the heap you obtained after doing some operations).
i
1
2
3
4
5
6
7
8
9
10
A[i]
11
13
15
17
19
21
23
25
27
29
(a) On the answer sheet, show the result after applying heap-extract-min(A) to the min-heap at the start of this question.
(b) On the answer sheet, show the result after applying heap-decrease-key(A, 9, 10) to the min-heap at the start of this question.
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(c) On the answer sheet, show the result after applying min-heap-insert(A, 9) to the min-heap at the start of this question.
Q3 (15 points) This question is related to disjoint set operations. Assume that we are using union by rank and nd with path compression. Suppose that you are given a disjoint set structure described by the following array. The following three sub-questions all refer to this disjoint set (not the disjoint set you obtained after doing some operations).
i
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A[i]
3
1
1
3
1
5
5
7
3
9
9
11
9
13
13
15
(a) On the answer sheet, show the result after applying union(16, 4) to the disjoint set at the start of this question.
(b) On the answer sheet, show the result after applying union(6, 14) to the disjoint set at the start of this question.
(c) On the answer sheet, show the result after applying find-set(7), find-set(15) to the disjoint set at the start of this question.
Q4 (8 points) On the answer sheet, answer the following questions.
(a) What is the worst-case time complexity of build-heap on n elements?
(b) What is the worst-case time complexity of extract-max on a max-heap with n elements?
(c) What is the worst-case time complexity of insertion onto a max-heap with n elements?
(d) What is the worst-case time complexity of increase-key onto a max-heap with n ele-ments?
(e) What is the worst-case time complexity of find-set in a disjoint set data structure, assuming we are using union by rank and nd with path compression?
(f) What is the worst-case time complexity of link in a disjoint set data structure, assuming we are using union by rank and nd with path compression?
(g) What is the worst-case time complexity of union in a disjoint set data structure, assuming we are using union by rank and nd with path compression?
(h) What is the worst-case time complexity of m operations of union, find, and make-set, including n make-set operations at the start?
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