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 51598

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 77160

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

12 31497

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

17 33774

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

5 22758

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 35161

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 66240

Which sort show the best average behavior?

9 35381

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

5 16692

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

Fidelity, Infosys,

20 43815

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

College School Exams Tests, Microsoft,

7 61903

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

Infosys, NIC, TTA, Wipro,

42 104581

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

11 36449

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

BPO, Microsoft,

13 52831

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 46131

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Un-Answered Questions { Data Structures }

Explain binary searching, Fibonacci search.

904

What is example of data?

1011

What is a multiset table?

817

Which sorting algorithm is used in collections sort?

772

Describe the level term in a tree.

877

What is meant by hashing?

805

How can avl tree be useful in all the operations as compared to binary search tree?

809

What is the need for path compression?

1024

Why set will not allow duplicates?

841

Can a binary tree be empty?

880

What are the different types of data structures?

948

What is data type and its types?

875

How to excel in data structures and algorithms?

915

What is data structure and its types?

856

Does linkedhashset allow duplicates?

842

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