Using a Fibonacci sequence can decrease run times in a program. That way, a programmer doesn’t need to recompute the solution. Given an integer “n,” write a function to compute the nth Fibonacci numberĭynamic programming involves separating a complex problem into simpler sub-problems and storing the solution to each sub-problem. Related: How To Prepare for 5 Common jQuery Interview Questions 5. If no loop is detected, the function returns false.” To answer this question well, you should have a solid knowledge of recursion as it is a recursive data structure.Įxample: “To detect and remove a loop in a linked list, you should write a detectAndRemoveLoop function, which checks for loop in a linked list and then removes it if present and then returns true. Loops in a linked list could cause errors in the program. Generally, a linked list is a data structure constructed from nodes, each consisting of a data field and a link that points to the next node in the list. However, whereas an array stores its elements in contiguous locations, linked lists store elements randomly and link them through pointers. How would you detect and remove a loop in a linked list?Ī linked list is a data structure that, like an array, is linear. The search will start in the middle of the list and then determine from there whether to continue the search at the top end or the bottom end.” 4. Answer confidently and provide a real-world example applicable to the hiring company.Įxample: “You can use the binary search algorithm with a list of ordered and sorted elements. The hiring manager might ask a question like this to ascertain your decision-making skills. Related: Mastering the Interview: Coding Interview Questions 3. The LinkedHasSet should be converted back to an ArrayList, which will then contain all elements with duplicates removed.” The second, and better, way in which you can remove duplicates from an array, is by creating a LinkedHashSet from the original ArrayList, which will automatically remove duplicates as it does not allow the latter. The second ArrayList will contain all elements of the original array minus the duplicate elements. Then you need to traverse the original ArrayList, which contains the duplicate values, and store the first appearance of each element in the new ArrayList using the contains() method. To do so, you need to create a new ArrayList. To successfully answer this Java array question, you should have a foundational knowledge of Java and how to apply constructors, like recursions and loops.Įxample: “I can describe two ways in which you can do this. Since it's a fundamental data structure, you may encounter several different questions related to arrays during the interview process. How would you remove duplicates from a given array in Java?Īn array is a structure most programming languages use to implement other data structures, such as strings, stacks, queues and lists. Related: 9 Common Data Structures Every Programmer Should Know 2. However, it is most useful in database management, analyzing numbers, graphics and compiler design.” Show you will be able to appropriately structure their data by referencing elements specific to the company.Įxample: “Data structures can effectively be applied anywhere data exists. Your answer will demonstrate your understanding of what the interviewing company does. Here are common algorithm and data structure interview questions with explanations and example answers. How many queues do you need to execute a priority queue? What is the difference between a “push” and a “pop?” What is the difference between “null” and “void?” Your answers to these general questions will show the interviewer that you understand how data structures work. Related: Top 45 Programming Interview Questions (with Sample Answers) General questions on data structures Will you be able to explain data structures to colleagues unfamiliar with programming? How did your last position prepare you for this role?ĭid your last position involve data structures? These common questions are framed to gain information about your specific knowledge and skills: In this article, we will review 35 questions you may be asked during your interview, covering general and technical questions and in-depth questions about data structures and algorithms to help your prepare your answers. By reviewing commonly asked questions for a data structure and algorithm role, you can prepare thorough, detailed responses that will impress. If you’ve lined up a job interview for a programming, coding or software development position, you should make preparing skillful answers on data structure and algorithms part of your interview preparation. A hallway shows two rows of databases in operation, with another group of databases at the far end of a computer room.
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