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WGU C949 STUDY GUIDE (MOST IMPORTANT QUIZ) QUESTIONS AND ANSWERS 100% CORRECT
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WGU C949 STUDY GUIDE (MOST IMPORTANT QUIZ)
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WGU C949 STUDY GUIDE (MOSTIMPORTANT QUIZ)
Array - answerA data structure that stores an ordered list of items, each item is directly
accessible by a positional index.
Linked List - answerA data structure that stores ordered list of items in nodes, where
each node stores data and has a pointer to the next node.
Binary Search Tree - answerA data structure in which each node stores data and has
up to two children, known as a left child and a right child.
Hash Table - answerA data structure that stores unordered items by mapping (or
hashing) each item to a location in an array (or vector).
Hashing - answermapping each item to a location in an array (in a hash table).
Chaining - answerhandles hash table collisions by using a list for each bucket, where
each list may store multiple items that map to the same bucket.
Hash key - answervalue used to map an index
bucket - answerEach array element in a hash table
(A 100 elements hash table has 100 buckets)
modulo hash function - answerComputes a bucket index from the items key.
It will map (num_keys / num_buckets) keys to each bucket.
ie... keys range 0 to 49 will have 5 keys per bucket.
= 5
hash table searching - answerHash tables support fast search, insert, and remove.
Requires on average O(1)
Linear search requires O(N)
modulo operator % - answerComputes the integer remainder when dividing two
numbers in a hash table.
Ex: For a 20 element hash table, a hash function of key % 20 will map keys to bucket
indices 0 to 19.
, Max-Heap - answerA binary tree that maintains the simple property that a node's key is
greater than or equal to the node's childrens' keys.
Heap storage - answerHeaps are typically stored using arrays. Given a tree
representation of a heap, the heap's array form is produced by traversing the tree's
levels from left to right and top to bottom. The root node is always the entry at index 0 in
the array, the root's left child is the entry at index 1, the root's right child is the entry at
index 2, and so on.
Max-heap insert - answerAn insert into a max-heap starts by inserting the node in the
tree's last level, and then swapping the node with its parent until no max-heap property
violation occurs.
The upward movement of a node in a max-heap is sometime called percolating.
Complexity O(logN)
Max-heap remove - answerAlways a removal of the root, and is done by replacing the
root with the last level's last node, and swapping that node with its greatest child until no
max-heap property violation occurs.
Complexity O(logN)
Percolating - answerThe upward movement of a node in a max-heap
Min-Heap - answerSimilar to a max-heap, but a node's key is less than or equal to its
children's keys.
Linked list vs Array - answerIf a program requires fast insertion of new data, a linked list
is a better choice than an array.
Abstract Data Type (ADT) - answerA data type described by predefined user
operations, such as "insert data at rear," without indicating how each operation is
implemented.
List - answerAn ADT for holding ordered data.
Data Structure Types: Array, linked list
Tuple - answerArray Type
An immutable(fixed) container with ordered elements.
Stack - answerAn ADT in which items are only inserted on or removed from the top of a
stack.
*Last-in First-Out
Underlying data structures: Linked list
Push(stack, x), pop(stack), peek(stack), IsEmpty(stack), GetLength(stack)
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