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 46801

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 70932

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

12 27514

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

17 29735

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

5 20962

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 31524

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 60937

Which sort show the best average behavior?

9 33002

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

5 14570

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

Fidelity, Infosys,

20 38054

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

College School Exams Tests, Microsoft,

7 59231

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

Infosys, NIC, TTA, Wipro,

42 93889

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

11 33585

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

BPO, Microsoft,

13 48138

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 41451


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Un-Answered Questions { Data Structures }

Define a full binary tree ?

508


What are the advantages of selecetion sort?

664


What is the main advantage of a linked list?

483


Which is the simplest file structure?

528


What you mean by sorting?

479






What is raid (redundant array of inexpensive disks)?

527


What is immutablelist?

462


Is an arraylist a vector?

476


What is a Stack? Explain with example?

528


What is data structure and why it is important?

457


List the data structures which are used in rdbms, network data modal, and hierarchical data model.

499


Can you dynamically allocate arrays in expanded memory?

592


How many links are there in a binary tree of N nodes?

577


Differentiate between comparable and comparator.

610


What is a matrix?

531