DATA STRUCTURES AND ALGORITHMS
EXAM QUESTIONS WITH 100%
CORRECT ANSWERS L LATEST
VERSION 2025/2026.
Foundations of data structures - ANS 1) interface AND 2) implementation
interface - ANS -represents the set of operations that a data structure supports
-only provides the list of supported operations, type of parameters they can accept and return
type of these operations
interface - ANS a group of related methods with empty bodies
implementation - ANS -provides the internal representation of a data structure
-also provides the definition of the algorithms used in the operations of the data structure
characteristics of data structures - ANS 1) correctness
2) time complexity
3) space complexity
correctness - ANS data structure implementation should implement its interface correctly
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, time complexity - ANS running time or execution time of operations of data structure must
be as small as possible
space complexity - ANS memory usage of a data structure operation should be as little as
possible
need for data structure - ANS 1) data search
2) processor speed
3) multiple requests
data search - ANS Consider an inventory of 1 million(106) items of a store. If application is to
search an item. It has to search item in 1 million(106) items every time slowing down the
search. As data grows, search will become slower
processor speed - ANS although being very high, falls limited if data grows to billion records
multiple requests - ANS as thousands of users can search data simultaneously on a web
server,even very fast server fails while searching the data
execution time cases - ANS 1) worst case
2) average case
3) best case
worst case - ANS This is the scenario where a particular data structure operation takes
maximum time it can take. If a operation's worst case time is ƒ(n) then this operation will not
take time more than ƒ(n) time where ƒ(n) represents function of n.
average case - ANS This is the scenario depicting the average execution time of an operation
of a data structure. If a operation takes ƒ(n) time in execution then m operations will take mƒ(n)
time.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
EXAM QUESTIONS WITH 100%
CORRECT ANSWERS L LATEST
VERSION 2025/2026.
Foundations of data structures - ANS 1) interface AND 2) implementation
interface - ANS -represents the set of operations that a data structure supports
-only provides the list of supported operations, type of parameters they can accept and return
type of these operations
interface - ANS a group of related methods with empty bodies
implementation - ANS -provides the internal representation of a data structure
-also provides the definition of the algorithms used in the operations of the data structure
characteristics of data structures - ANS 1) correctness
2) time complexity
3) space complexity
correctness - ANS data structure implementation should implement its interface correctly
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, time complexity - ANS running time or execution time of operations of data structure must
be as small as possible
space complexity - ANS memory usage of a data structure operation should be as little as
possible
need for data structure - ANS 1) data search
2) processor speed
3) multiple requests
data search - ANS Consider an inventory of 1 million(106) items of a store. If application is to
search an item. It has to search item in 1 million(106) items every time slowing down the
search. As data grows, search will become slower
processor speed - ANS although being very high, falls limited if data grows to billion records
multiple requests - ANS as thousands of users can search data simultaneously on a web
server,even very fast server fails while searching the data
execution time cases - ANS 1) worst case
2) average case
3) best case
worst case - ANS This is the scenario where a particular data structure operation takes
maximum time it can take. If a operation's worst case time is ƒ(n) then this operation will not
take time more than ƒ(n) time where ƒ(n) represents function of n.
average case - ANS This is the scenario depicting the average execution time of an operation
of a data structure. If a operation takes ƒ(n) time in execution then m operations will take mƒ(n)
time.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
