This set of Data Structures & Algorithms Multiple Choice Questions & Answers (MCQs) focuses on “D-ary Heap”.
1. d-heap is similar to that of a?
a) binary heap
b) fibonacci heap
c) leftist heap
d) treap
View Answer
Explanation: A d-heap is similar to that of a binary heap except that binary heaps have two children and d-heaps have d children.
2. d-heap is shallower than a binary heap.
a) true
b) false
View Answer
Explanation: d-heap is much shallower than a binary heap with respect to performance efficiency of insert and delete operations.
3. Which operation cannot be directly performed in a d-heap?
a) insert
b) delete
c) find
d) create
View Answer
Explanation: Find operation in a d-heap cannot be performed as in other heaps. This is the main weakness of d-heap.
4. Which operation is not efficiently performed in a d-heap?
a) insert
b) delete
c) find
d) merge
View Answer
Explanation: Unlike find operation, which cannot be performed in a d-heap, the task of merging two d-heaps is very difficult.
5. What is the run time efficiency of an insertion algorithm in d-heap?
a) O(N)
b) O(log N)
c) O(logd N)
d) O(Nd)
View Answer
Explanation: The run time efficiency of an insertion algorithm in a d-heap is found to be O(logd N) where d is the number of children.
6. How many comparisons will occur while performing a delete-min operation?
a) d
b) d-1
c) d+1
d) 1
View Answer
Explanation: Since, the delete-min operation is more expensive and the heap is shallow, the minimum of d elements can be found using d-1 comparisons.
7. How many basic operations can be performed in a d-heap?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: The two basic operations performed in a d-heap are insert and delete-min operations.
8. What is the run time efficiency of delete-min operation?
a) O(log N)
b) O(logd N)
c) O(d logd N)
d) O(d)
View Answer
Explanation: The run time efficiency of a delete-min algorithm using d-1 comparisons is mathematically found to be O(d logd N).
9. The following figure is an example for
a) d-heap
b) binary heap
c) leftist heap
d) skew heap
View Answer
Explanation: The given heap is a d-heap since it looks like a binary heap with d- children. Here, d=3.
10. Multiplication and division to find children and parents cannot be implemented in a d-heap.
a) true
b) false
View Answer
Explanation: Multiplication and division for finding children and parents can be implemented in a d-heap but d should be a power of 2.
11. How many secondary operations are performed in a d-heap?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: The other operations that can be performed in a d-heap are increasekey, decreasekey, buildheap and delete.
12. On which data structure is a d-ary heap based?
a) stack
b) queue
c) linked list
d) priority queue
View Answer
Explanation: d-ary heap is a priority queue based data structure that is a generalization of binary heaps.
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