Data Structures Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

An array having 100 elements have numbers from 1 to 99 randomly out of which any number is repeated. Find the repeated number in minimum time and space complexity.

1173

Explain the difference between a list and array.

TCS,

959

Check if duplicates exist in an array of N which has range 1 to N.

Expedia, GrapeCity,

968

What is the difference between Array and Array List ? Explain in brief with example.

MCN Solutions,

971

What is the procedure to insert into a sorted array?

Wipro,

984

Tell me the difference between the character array and a string.

Honeywell, HPCL, Huawei, Zomato,

958

What will happen if an array goes out of bounds?

Amdocs, HAL,

1099

Explain the Queue

Tech Mahindra,

1014

Why it is important to have aligned addresses? What is the exception generated when there is a misaligned address?

Ciena,

900

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Un-Answered Questions { Data Structures }

Can a null element added to a treeset or hashset?

870

Is arraylist synchronized?

980

Why is map not a collection?

856

What is a cycle or a circuit?

1056

Define indegree of a graph?

1076

By Which algorithm, the 8 queens problem is solved?

915

Is list same as array?

835

How will you reverse Linked List.

900

Can a hashmap have duplicate keys?

927

How does selection sort work?

895

write an algorithm to show the procedure of insertion into a b-tree?

931

What is the use of tree data structure?

875

Write a Program for Reverse a linked list.

953

Differentiate linear from non linear data structure?

978

What is inplace sorting?

1068

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