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 52218

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 78093

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

12 31873

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

17 34342

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

5 22918

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 35549

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 66843

Which sort show the best average behavior?

9 35657

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

5 16880

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

Fidelity, Infosys,

20 44428

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

College School Exams Tests, Microsoft,

7 62222

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

Infosys, NIC, TTA, Wipro,

42 105937

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

11 36841

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

BPO, Microsoft,

13 53249

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 46742

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Un-Answered Questions { Data Structures }

Which interfaces are implemented by printerstatereasons?

899

What is the difference between hashset and hashtable?

935

Which sorting algorithm uses minimum number of swaps?

868

Parenthesis is never required in postfix or prefix expressions, why?

901

What is comparable interface?

961

Define graph?

1108

How does threaded binary tree represented in data structure?

1013

Which programming language is best for data structures?

891

Can arraylist contain null?

844

What does the dummy header in linked list contain?

1102

What are the disadvantages of linked list over array?

910

Why do we need linked lists?

930

What sort does arrays sort use?

866

What is the minimum number of nodes in an avl tree of height h?

886

How will you check the validity of an expression containing nested parentheses?

938

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