WGU C949 Data Structures And Algorithms I: Questions With Comprehensive Solutions

WGU C949 Data Structures And Algorithms I:
Questions With Comprehensive Solutions
Which statement describes a queue data structure? Correct
Answer - It is a sequence of elements in which insertions can
take place only at the back end and deletions can take place only at
the front end.

What are the official indexes for the list list01 given this declaration?
int[ ] list01 = {0, 2, 4, 6, 8, 10}; Correct Answer - 0, 1, 2, 3, 4, 5

Which abstract data type (ADT) has elements of the same type so
that the elements can be retrieved based on the index or position?
Correct Answer - List

Which category of data does ("FB", 75.00, 75.03, 74.90) represent in
the pseudocode?
import datetime
def middle(stock, date):
symbol, current, high, low = stock
return (((high + low) / 2), date)

mid_value, date = middle(("FB", 75.00, 75.03, 74.90),
datetime.date(2014, 10, 31)) Correct Answer - Tuple

Which data type does the mystery function return?
return_type mystery (int R)
{
int NumUnits = R;return NumUnits * 3.14;
} Correct Answer - Double

Which value is appropriate for the variable middle given the
pseudocode?

,function mystery()
{
string last;
string first;
char middle;
int phone;
float rate;
} Correct Answer - 'D'

What is the most efficient data type to use for this data set of a fixed
size in Java?
a = [0, 0, 1, 4, 7, 16, 31, 64, 127] Correct Answer - Array

What is true about garbage collection? Correct Answer - It
reclaims memory from data structures implemented using linked
allocations.

What is true about a data structure implemented using linked
allocation? Correct Answer - Storage is allocated using
pointers to new locations as needed.

What are the array elements corresponding to the mid-values in the
first and second iterations of a binary search in an array arr = {45,
77, 89, 90, 94, 99, 100} and key = 100? Correct Answer - 90
and 99

What is the effect on the object Computing regarding garbage
collection?
Computing obj = new Computing(); obj = null; Correct Answer -
It is automatically available for garbage collection.

What are the mid-values in the first and second levels of recursion in
this binary search?

,int arr = {46, 76, 89, 90, 94, 99, 100} and key = 99 Correct Answer
- 90 and 99

Which data set is represented using the dictionary data type?
Correct Answer - A set of students and their test scores

What is a characteristic of keys in an associative dictionary data
type? Correct Answer - They are unique and immutable.

Which method can be used to take a value out of a dictionary?
Correct Answer - D1[key].remove(value)

Given this data dictionary in Python:
dict = {'white':0x0000, 'black':0x1111}

Which command/function generates the output ['white','black']?
Correct Answer - dict.keys()

Items were added sequentially in this stack starting with 'ham':
'sausage'
'toast'
'eggs'
'ham'

What is the correct order of contents after the push operation is
performed with the value 'bacon'? Correct Answer - 'bacon'
'sausage'
'toast'
'eggs'
'ham'

Items were added sequentially in this stack starting with "dog":
"bird"
"rabbit"

, "cat"
"dog"

What is the return value of the pop operation? Correct Answer -
"bird"

Which sequence of letters represents preorder traversal of the
nodes of this tree?
A
/\
BC
/\
/\
DE
\/\
FGH
/
I Correct Answer - ABCDFEGIH

An array soc of size 1009 is used where the index is an integer in
[0,1008] and the hash-function key%1009.

Where will the data associated with the key given by the last 4 social
security digits '2023' be stored? Correct Answer - In soc[5]

A stack s, a queue q, and a max value priority queue p each have a
single 3 in them. Next s.push(4), q.push(4), and p.push(4) are
executed.

What is the triple (s.pop(), q.pop(), p.pop())? Correct Answer -
(4,3,4)

This stack reads left to right with the top to the right:
'green'