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 51472

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 77026

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

12 31414

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

17 33656

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

5 22717

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 35082

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 66076

Which sort show the best average behavior?

9 35319

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

5 16639

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

Fidelity, Infosys,

20 43665

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

College School Exams Tests, Microsoft,

7 61840

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

Infosys, NIC, TTA, Wipro,

42 104270

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

11 36381

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

BPO, Microsoft,

13 52754

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 45977

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Un-Answered Questions { Data Structures }

Can arraylist contain duplicates?

802

What is data type and its types?

868

What package is arraylist?

966

What is height balanced tree?

875

What is entryset in hashmap?

862

What is difference between hashmap and arraylist?

910

What is the Role of push() and pop() method?

958

What is map entry?

825

Explain quick sort?

900

What is a treemap used for?

832

How does a treemap work?

935

Do sets allow duplicates?

889

Define parent node?

916

What is data type explain?

1034

What is selection in an algorithm?

814

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