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 Insertion sort, selection sort, bubble sort( basic differences among the functionality of the three sorts and not the exact algorithms)?

TCS,

986

Write an algorithm to check if there is a loop in a doubly linked list.

DELL,

950

Write an algorithm to find middle element in the linked list.

JPMorgan Chase,

914

Write is a binary search tree? Write an algorithm and tell complexity?

ITC Indian Tobacco Company,

904

How will you sort the elements of array in descending order?

Wipro,

955

How would you sort words in a large file?

DELL,

904

Write a program for Sorting an Array. Which sorting will you prefer?

966

Can you distinguish between ArrayList and Array?

QuestPond,

1076

Program to remove duplicate elements in an array.

InterGraph,

1020

Explain the Stack

Tech Mahindra,

971

How would you implement two stacks using a single array?

TCS,

989

What happens if an array goes out-of-bounds?

TCS,

1085

Write a code for dynamic allocation of array.

iNautix,

1049

If you have to store one lakh objects, what will be a better option- a hash map or an array list?

DELL,

1206

Is Arraylist faster than Array? Why?

QuestPond,

1016

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Un-Answered Questions { Data Structures }

How do you initialize an arraylist?

974

Can we put null key in hashmap?

897

Which interface provides the capability to store objects using a key-value pair?

1106

Suppose in an integer array, there is 1 to 100 number, out of one is duplicate, how to find?

967

What can be stored in an arraylist?

953

What is a weighted graph?

1022

Is hashmap fail safe?

980

What is hashing technique?

936

Define a binary tree?

978

What are the tasks performed during preorder traversal?

1152

Why is map not a collection?

856

Why we use linked list?

911

Why insertion is faster in linked list?

834

When is a graph said to be weakly connected?

997

What are the advantages of modularity?

959

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