If the space reserved for the dynamic array is exceeded, it is reallocated and possibly copied, which is an expensive operation. Linked lists have several advantages over dynamic arrays. Insertion or deletion of an element at a specific point of a list, assuming that we have indexed a pointer to the node before the one to be removed, or before the insertion point already, is a constant-time operation otherwise without this reference it is O nwhereas insertion in a dynamic array at random locations will require moving half of the elements on average, and all the elements in the worst case. While one can "delete" an element from an array in constant time by somehow marking its slot as "vacant", this causes fragmentation that impedes the performance of iteration.
Since data structures are core programming concept, it's mandatory for all programmers, to know basic data structures like stack, linked list, queue, array, tree, and graph. Though tree and graph are on the tougher side, I still see programmers get familiar will all these.
Any list of programming job interview questions is incomplete without questions from data structures and algorithms. Similarly, while going on questions from data structure you may get some programming exercise as well e. The li nked list and array are favorite topics in any data structure interview, questions like reversing a linked list, traversing linked list or deleting nodes from the linked list, which involves algorithm and data structures are quite common.
Similarly, finding duplicates in an array, finding missing numbers, sorting arrays are very popular.
You can also expect questions from the stack, queue, array, linked list, tree, graph, and hash table are most common in any data structure interview. Let us know if you have any interesting questions from data structures and algorithm, which you faced during any Java interviews.
Btw, you need some understanding of basic data structure before solving these questions. There is no point in attempting these questions if you don't know how to access elements from an array or linked list or can't even code them using the programming language of your choice.
Deep Dive Using Java. This way you can get the best of both the world, you will learn data structure and algorithms and also prepare for the interview.
Data Structures and Algorithm Interview Questions for Java Programmers This is a combined list of questions from the various data structures e. It includes some coding questions as well, which gel with data structures. How to find middle element of linked list in one pass?
One of the most popular question from data structures and algorithm mostly asked on a telephonic interview. Since many programmers know that, in order to find the length of a linked list we need to first traverse through the linked list till we find the last node, which is pointing to null, and then in second pass we can find a middle element by traversing only half of length.
They get confused when the interviewer asks him to do the same job in one pass i. In order to find middle element of linked list in one pass, you need to maintain two-pointer, one increment at each node while other increments after two nodes at a time, by having this arrangement, when the first pointer reaches the end, the second pointer will point to a middle element of the linked list.
See this trick to find middle element of linked list in a single pass for more details. How to find if a linked list has a loop? This question has a bit of similarity with the earlier algorithm and data structure interview question. I mean we can use two pointer approach to solve this problem.
If we maintain two pointers, and we increment one pointer after processing two nodes and other after processing every node, we are likely to find a situation where both the pointers will be pointing to the same node. This will only happen if a linked list has a loop or cycle. You can check my article linked list with cycles for more details.
How to find the third element from the end in a linked list in one pass? This is another frequently asked linked list interview question. This question is exactly similar to find middle element of linked list in a single pass. If we apply the same trick of maintaining two pointers and increment another pointer, when first has moved up to the 3rd element, then when the first pointer reaches to the end of the linked list, the second pointer will be pointing to the 3rd element from last in a linked list.
Sometimes, interviewers can also generalize this problem and ask him to find the kth element from the tail, end or last. Just use the same logic, replace 3 with k and you can solve the problem. I have one and I also suggest all developers have that plan because Pluralsight is like NetFlix for Software developers.
Btw, it also offers a day free trial without any obligation which allows you to watch hours of content. You can watch this course for free by signing for that trial. In an integer array, there is 1 to number, out of one is duplicate, how to find? This is a rather simple data structures question, especially for this kind of.
Now just subtract actual sum to expected sum, and that is your duplicate number. By the way, this trick will not work if an array has multiple duplicates or its not numbers forming an arithmetic progression. Here is an example of one way to find the duplicate number in the array.
How to reverse String in Java? This is one of my favorite questions. Since String is one of the most important types of programming, you expect a lot of question-related to String any data structure interview. There are many ways to reverse Sting in Java or any other programming language, and the interviewer will force you to solve this problem by using without API i.Linked lists are among the simplest and most common data structures.
They can be used to implement several other common abstract data types, including lists, stacks, queues, associative arrays, and S-expressions, though it is not uncommon to implement those data structures directly without using a linked list as the basis..
The principal benefit of a linked list . A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.
Write a C program using pointers to implement a stack with all the operations. Program to implement stack with its operations using pointers.
Given a singly linked list, determine if its a palindrome. Return 1 or 0 denoting if its a palindrome or not, respectively. Notes: – Expected solution is linear in time and constant in space.
Given a singly linked list, determine if its a palindrome. Return 1 or 0 denoting if its a palindrome or not, respectively. Notes: – Expected . Kumite (ko͞omiˌtā) is the practice of taking techniques learned from Kata and applying them through the act of freestyle sparring.
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