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 52203

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 78075

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

12 31864

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

17 34323

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

5 22912

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 35543

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 66831

Which sort show the best average behavior?

9 35653

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

5 16877

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

Fidelity, Infosys,

20 44403

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

College School Exams Tests, Microsoft,

7 62218

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

Infosys, NIC, TTA, Wipro,

42 105893

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

11 36835

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

BPO, Microsoft,

13 53238

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 46717

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Un-Answered Questions { Data Structures }

Is tuple immutable?

850

What is a minimum spanning tree?

1068

What is the difference between data type and data structure?

869

What is ascii sort order?

908

What is data structure what is need of it?

887

Why is hashmap used?

948

Define a binary tree?

978

Does treemap allow null keys?

935

What is the default size of an arraylist?

936

How does threaded binary tree represented in data structure?

1010

What is the order of selection sort?

813

Can a tree be empty?

881

Describe queue operation.

974

Is it possible to store null key and null values in a hashmap?

846

Why it is important to have aligned addresses? What is the exception generated when there is a misaligned address?

900

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