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.

1219

Explain the difference between a list and array.

TCS,

1009

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

Expedia, GrapeCity,

1011

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

MCN Solutions,

1012

What is the procedure to insert into a sorted array?

Wipro,

1034

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

Honeywell, HPCL, Huawei, Zomato,

1014

What will happen if an array goes out of bounds?

Amdocs, HAL,

1141

Explain the Queue

Tech Mahindra,

1065

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

Ciena,

956

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Un-Answered Questions { Data Structures }

Is collection a class or interface?

956

What is a Queue? Explain its operation with example?

1060

Is array faster than arraylist?

1011

Define a binary tree?

1032

List out a few of the applications that make use of Multilinked Structures?

1219

Is quicksort greedy algorithm?

1136

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

956

What is reduction to sorting method?

1004

Briefly explain recursive algorithm?

1075

What is a binary search tree? Explain with example?

957

List out the applications of a linked list?

930

What is different between array and list?

966

Differentiate between an array and an arraylist.

1126

Is hashmap a data structure?

1051

Explain the common uses of tree database.

981

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