Data Structures Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Data Structures Interview Questions

Questions Answers Views Company eMail

What is the maximum total number of nodes in a tree that has N levels? Note that the root is level (zero)

CSC, National Instruments, Sasken, Sybrant Technologies,

18 52134

How many different binary trees and binary search trees can be made from three nodes that contain the key values 1, 2 & 3?

Accenture, Amazon, College School Exams Tests, iGate, Microsoft, TCS, Wipro,

28 77931

A list is ordered from smaller to largest when a sort is called. Which sort would take the longest time to execute?

12 31834

A list is ordered from smaller to largest when a sort is called. Which sort would take the shortest time to execute?

17 34237

When will you sort an array of pointers to list elements, rather than sorting the elements themselves?

5 22898

The element being searched for is not found in an array of 100 elements. What is the average number of comparisons needed in a sequential search to determine that the element is not there, if the elements are completely unordered?

Morgan Stanley, Wipro,

11 35488

What is the average number of comparisons needed in a sequential search to determine the position of an element in an array of 100 elements, if the elements are ordered from largest to smallest?

ABB, SDE,

19 66739

Which sort show the best average behavior?

9 35622

What is the average number of comparisons in a sequential search?

5 16852

Which data structure is needed to convert infix notations to post fix notations?

Fidelity, Infosys,

20 44305

What do you mean by: Syntax Error, Logical Error, Runtime Error?

College School Exams Tests, Microsoft,

7 62176

In which data structure, elements can be added or removed at either end, but not in the middle?

Infosys, NIC, TTA, Wipro,

42 105704

How will inorder, preorder and postorder traversals print the elements of a tree?

11 36800

Parenthesis are never needed in prefix or postfix expressions. Why?

BPO, Microsoft,

13 53203

Which one is faster? A binary search of an orderd set of elements in an array or a sequential search of the elements.

Syntel, TCS,

22 46652

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Un-Answered Questions { Data Structures }

List the types of rotations available in splay tree?

1141

What is array define its types?

946

Which sort is best for linked list?

862

Questions related to arrays, such as given a 2 integer array, find the common elements.

924

What is max heapify?

874

What do you mean by sorting?

850

What are vectors used for in real life?

874

What is bubble sort and quick sort?

943

Define an algorithm. What are the properties of an algorithm? What are the types of algorithms?

915

What is the main advantage of a linked list?

989

Give a real time example of stack

944

Which collection type is used to maintain uniqueness of data structure?

1474

State the demerits of linked representation of binary trees?

923

How can we delete any specific node from the linked list?

916

Is quicksort recursive?

962

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