C949- DATA STRUCTURES AND
ALGORITHMS I EXAM QUESTIONS
WITH 100% CORRECT ANSWERS L
LATEST VERSION 2025/2026.
Which statement describes a queue data structure? - ANS 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.
Which data structure allows inserting and deleting data elements at both the front and the
rear? - ANS Deques
Which data structure allows elements to be inserted and deleted from one end and provides no
direct access to the other end? - ANS Stack
What are the official indexes for the list list01 given this declaration? int[ ] list01 = {0, 2, 4, 6, 8,
10}; - ANS 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? - ANS List
Which data structure allows insertion and removal from only one end of the data structure? -
ANS Stack
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Which data type does the mystery function return?
return_type mystery (int R)
{
int NumUnits = R;return NumUnits * 3.14;
} - ANS Double
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)) - ANS Tuple
Which value is appropriate for Test1 given the expression?
char Test1; - ANS 'L'
Which value is appropriate for the variable middle given the pseudocode?
function mystery()
{
string last;
string first;
char middle;
int phone;
float rate;
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, } - ANS 'D'
Which type of operation is represented in the pseudocode?
int x,y,z;
x=y=z=100; - ANS Assignment
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] - ANS Array
Which data type is appropriate for this array to store the given data?
a = ["AF", "71", "BC", "157", "BA", "253"] - ANS String
Which data type is appropriate for the given data set?
a = [1, 717, 23, 12, 314, 6] - ANS Int
Which data type should be used for this object?
days = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"} -
ANS String
Which data type should be used for this variable?
phoneNum = "212-555-1212" - ANS String
What is true about garbage collection? - ANS It reclaims memory from data structures
implemented using linked allocations.
What is true about a data structure implemented using linked allocation? - ANS Storage is
allocated using pointers to new locations as needed.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ALGORITHMS I EXAM QUESTIONS
WITH 100% CORRECT ANSWERS L
LATEST VERSION 2025/2026.
Which statement describes a queue data structure? - ANS 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.
Which data structure allows inserting and deleting data elements at both the front and the
rear? - ANS Deques
Which data structure allows elements to be inserted and deleted from one end and provides no
direct access to the other end? - ANS Stack
What are the official indexes for the list list01 given this declaration? int[ ] list01 = {0, 2, 4, 6, 8,
10}; - ANS 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? - ANS List
Which data structure allows insertion and removal from only one end of the data structure? -
ANS Stack
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Which data type does the mystery function return?
return_type mystery (int R)
{
int NumUnits = R;return NumUnits * 3.14;
} - ANS Double
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)) - ANS Tuple
Which value is appropriate for Test1 given the expression?
char Test1; - ANS 'L'
Which value is appropriate for the variable middle given the pseudocode?
function mystery()
{
string last;
string first;
char middle;
int phone;
float rate;
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, } - ANS 'D'
Which type of operation is represented in the pseudocode?
int x,y,z;
x=y=z=100; - ANS Assignment
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] - ANS Array
Which data type is appropriate for this array to store the given data?
a = ["AF", "71", "BC", "157", "BA", "253"] - ANS String
Which data type is appropriate for the given data set?
a = [1, 717, 23, 12, 314, 6] - ANS Int
Which data type should be used for this object?
days = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"} -
ANS String
Which data type should be used for this variable?
phoneNum = "212-555-1212" - ANS String
What is true about garbage collection? - ANS It reclaims memory from data structures
implemented using linked allocations.
What is true about a data structure implemented using linked allocation? - ANS Storage is
allocated using pointers to new locations as needed.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
