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 52782

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 78879

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

12 32304

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

17 34788

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

5 23138

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 35917

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 67505

Which sort show the best average behavior?

9 35965

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

5 17058

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

Fidelity, Infosys,

20 45073

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

College School Exams Tests, Microsoft,

7 62497

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

Infosys, NIC, TTA, Wipro,

42 107110

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

11 37220

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

BPO, Microsoft,

13 53721

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 47460

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Un-Answered Questions { Data Structures }

What is dynamic array how it is created?

971

What is the difference between one and two dimensional?

1058

What are the difference between a stack and a queue?

1010

How is the front of the queue calculated ?

1254

Which one is the simplest sorting in data structure?

1113

What is the best case complexity of quicksort?

956

Explain the term recursive case?

1036

Why merge sort is better than insertion sort?

875

How null key is handled in hashmap?

953

What do you mean by data and data structure?

1032

Describe tree database.

944

What is a height of a tree?

946

Can we add elements to final list?

969

Is hashset a collection?

980

What is impact of signed numbers on the memory?

944

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