The Most Common Data Structures For Interview Coding

As a beginner in programming, you can confidently work on your projects. However, proving your worth in an interview by demonstrating impeccable programming skills can be difficult.

Aside from the pressure, you feel when your work hinges on a 45-minute speech, there’s one more thing that makes novice programmers uncomfortable. You can’t search for answers as usual unless you know how to solve a programming problem.

While you may be thinking about the daunting issue of code implementation when it comes to data structures online classes, the only thing that will save you is knowledge. Here are 6 of the most popular data structures to help you pass your next programming interview.


An array is one of the simplest data structures. Heaps, linked lists, etc. Are formed on the basis of arrays. Hence, knowing everything you can about arrays is critical to let your employers know that you are good at data management.

Most interviews start with a simple question. You may need to explain how arrays work and how implementing arrays in different languages ​​works. You may also need to provide some zero-based and indexed one-language examples. The most popular languages ​​today are zero-based, but some languages, such as Cobol and Fortran, are one-based.

Now that you have finished the basic questions, you need to answer the more advanced questions. You usually need to write the code to provide the answer to the actual problem and run the solution.

A good example of this is finding the second largest number in the array or removing duplicate entries.

In addition to the issue of duplicate entries, there is another question that often comes up in data structure interviews.

Stacks and queues

Both the stack and the queue are linear data structures, but the main difference is that the stack uses the Last In, First Out method while the queue uses the First In, First Out method. Essentially, a stack is a data structure in which the new items are put on top and are normally fetched from the top of the list, and a queue is a structure where new items are placed at the bottom and are fetched from above as well.

In addition to talking about the practical implementation of these two data structures, you will have to answer questions about implementing one like the other. That is, the interviewer may ask you how you would implement a queue using a stack or vice versa.

Linked list

Linked lists are the foundation for implementing queues and stacks and are essential for charting. In this structure, the elements of the array are interconnected, rather than indexed as in an array. This means you don’t have to re-declare memory if the array gets too large, since they don’t need to be near each other to work.

This data structure online training in python is a great solution when you need to delete or insert items in a list constantly and have no memory usage problems. In addition to explaining these differences in relation to arrays, there is a problem that will be mentioned in most linked list interviews – loops.

Hash table

Hash tables use hashing algorithms online classes to assign keys to index values, turning an array into a two-column table where you can’t select the value of the first column, but you can map it to the function itself. The easiest way to represent a hash table is to assign all letters of the alphabet a sequence number from 0 to 25, and then analyze how many times each letter occurs in a specific word.


Probably the biggest set of questions you’ll need to answer when it comes to trees is about typology. Although a tree data structure is a fairly simple structure with a parent node associated with zero or more child nodes, there are so many subtypes that you could spend half an hour just talking about them.

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