Along with array, binary tree, and linked list data structures, the string is another popular topic on programming job interviews. I have never participated in a coding interview where no string-based questions were asked.
This is very obvious because I have also never written a program where I have not used a single String variable. You will always find String as one of the most used data type or data structure in any program.
In this article, I am going to share some of the most common String based coding problems I have come across from many Programming interviews I have been part of. I also have experience from both side of the table as a candidate as well as Interviewer so I know how important these questions are.
Btw, there is no point solving these questions if you don’t have basic knowledge of data structure or you have not to refresh them in recent time. In that case, I suggest you to first go through a good data structure and algorithm course or book to revise the concept.
This will save you a lot of time going back and forth between the book and your IDE for each question.
If you need resources, I suggest following online courses to learn Data structure and Algorithms, even though they are independent of any programming language, I strongly suggest you join the course which explains problems in the programming language you are most comfortable with.
A good thing about the string data structure is that if you know the array data structure, you can easily solve string-based problems because strings are nothing but a character array.
So all the techniques you know by solving array-based coding questions can be used to solve string programming questions as well.
Here is my list of some of the frequently asked string coding questions from programming job interviews:
These questions help improve your knowledge of string as a data structure.
If you can solve all these String questions without any help then you are in good shape.
For more advanced questions, I suggest you solve problems given in the Algorithm Design Manual by Steven Skiena, a book with the toughest algorithm questions.
If you need to revise your Data Structure and Algorithms concepts then you can also see these resources:
2. Algorithms and Data Structures in Python for those who love Python
4. Mastering Data Structures & Algorithms using C and C++ for those who are good at C/C++
These are some of the best courses on data structures and algorithms and you can choose the one which is most suitable for you. Btw, I will receive payments if you buy these courses
These are some of the most common questions outside of data structure and algorithms that help you to do really well in your interview.
These common String based questions are the ones you need to know to successfully interview with any company, big or small, for any level of programming job.
If you are looking for a programming or software development job in 2018, you can start your preparation with this list of coding questions but you need to prepare other topics as well.
This list of 50+ data structure and algorithms problems provides good topics to prepare and also helps assess your preparation to find out your areas of strength and weakness.
Good knowledge of data structure and algorithms is important for success in coding interviews and that’s where you should focus most of your attention.
Further Learning10 Algorithm Books Every Programmer Should ReadTop 5 Data Structure and Algorithm Books for Java DevelopersFrom 0 to 1: Data Structures & Algorithms in JavaData Structure and Algorithms Analysis — Job Interview50+ Data Structure and Coding Problems for Programmers
Thanks, You made it to the end of the article … Good luck with your programming interview! It’s certainly not going to be easy, but you are one step closer after practicing these questions.
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P.S. — If you need some FREE resources, you can check out this list of free data structure and algorithm courses to start your preparation.