Data Structure Interview Questions & Answers

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Technical interview questions and answers are the foundation of any Data Structure Interview because companies use DSA to test your problem-solving ability, logic building, and coding efficiency. Data Structures such as arrays, linked lists, stacks, queues, trees, and graphs form the backbone of programming, making this topic one of the most important parts of technical rounds. In campus placements and company-specific interviews conducted by TCS, Infosys, Wipro, Cognizant, and Capgemini, these questions decide whether a candidate has strong fundamentals. This guide covers the most important and frequently asked Data Structure interview questions with clear explanations, helping freshers and job seekers understand concepts easily. Preparing these questions improves performance in coding tests, whiteboard interviews, and online assessments.

Computer science professionals should complement their algorithmic knowledge with C language implementation and Java programming techniques

Showing 10 of 108 questions

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91. What are the major data structures used in the following areas : network data model & Hierarchical data model.

RDBMS Array (i.e. Array of structures) Network data model Graph Hierarchical data model Trees

92. If you are using C language to implement the heterogeneous linked list, what pointer type will you use?

The heterogeneous linked list contains different data types in its nodes and we need a link, pointer to connect them. It is not possible to use ordinary pointers for this. So we go for void pointer. Void pointer is capable of storing pointer to any type as it is a generic pointer type.

93. Minimum number of queues needed to implement the priority queue?

Two. One queue is used for actual storing of data and another for storing priorities.

94. What is the data structures used to perform recursion?

Stack. Because of its LIFO (Last In First Out) property it remembers its ‘caller so knows whom to return when the function has to return. Recursion makes use of system stack for storing the return addresses of the function calls. Every recursive function has its equivalent iterative (non-recursive) function. Even when such equivalent iterative procedures are written, explicit stack is to be used.

95. What are the notations used in Evaluation of Arithmetic Expressions using prefix and postfix forms?

Polish and Reverse Polish notations.

96. Convert the expression ((A + B) * C (D E) ^ (F + G)) to equivalent Prefix and Postfix notations.

Prefix Notation: ^ * +ABC DE + FG Postfix Notation: AB + C * DE FG + ^

97. Sorting is not possible by using which of the following methods?

Deletion.

98. List out few of the Application of tree data-structure?

The manipulation of Arithmetic expression, Symbol Table construction, Syntax analysis.

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

Sparse matrix, Index generation.

100. in tree construction which is the suitable efficient data structure?

Linked list