![]() In order to find the length of the linked list, you can iterate over the linked list and keep a count of nodes until you reach the end of the linked list where the next node will be null. That's why it is often asked on telephonic interviews. ![]() This is one of the easiest linked list questions you can expect in an interview. How to find the length of a singly linked list in Java? ( solution) Write a recursive method to determine whether a linked list is sorted in descending order or not? If it's sorted then return true otherwise return false. In the two pointer approach, you have two pointers, fast and slow.Ĩ. If Interviewer says that you cannot loop twice and you just have to use one loop, then you can use the two pointer approach to solving this problem. You should clarify what does mean by one pass in this question. How to find the middle element of a singly linked list in one pass? ( solution) I am not sharing solution but you will find the solution of many articles in this blog itself, wherever possible have given links to the solution, and at some places I have also given hints to solve the problem by yourself.ġ. ![]() Here is my collection of some of the frequently asked linked list based coding interview questions. In order to find an element in a linked list, you need to traverse the linked list and compare each node value to the given value, this makes it an O(n) operation, not ideal when you need to frequently search, but the linked list is great for adding and removing nodes from the start and end because you just need to change one link and you don't need to shift elements like an array.Īlso, basic knowledge of essential data structure is also very important and that's why I suggest all Java programmers join a comprehensive Data Structure and Algorithms course like Data Structures and Algorithms: Deep Dive Using Javaon Udemy to fill the gaps in your understanding.ģ0 Linked list Interview Questions for Java Programmers The singly linked list allows you to traverse in the only forward direction, but doubly linked list allows you to traverse in both forward and backward direction. There is also two types of linked list, singly-linked list and doubly linked list. The first node in the linked list is called head while the last node is called the tail. This structure allows you to create a chain of nodes that are scattered through different memory areas, which is in stark contrast to the array, where elements always stay in the adjacent and contiguous memory location. You should try to solve this problem yourselves, before looking at the solution to get the full benefit of them.Ī linked list is nothing but a collection of nodes, where each node contains a value and pointer to the next node in the list. These linked list coding problems are not only good for coding interviews point of view but also very useful in learning programming. ![]() adding or removing nodes from a linked list, traversing order linked list and implementing linked list in your choice of programming language like Java, C++, C, or Python. Nevertheless, the point is that you should be familiar with linked list data structure and must know how to perform basics task in the linked list e.g. The range of questions can be from simple questions like finding the length of a linked list to very difficult like merging two sorted linked lists. Because of the way the nodes are pointing, push and pop operations are easy to accomplish.The linked list is one of the most common and essential data structure and that's why you would frequently find linked list based coding questions on interviews. The empty stack is represented by setting top to nut. Each node contains two fields: data(info) and next(link) The data field of each node contains an item in the stack and the corresponding next field points to the node containing the next item in the stack The top refers to the topmost node (The last item inserted) in the stack. A stack can be represented by using nodes of the linked list. Another way to represent a stack is by using a linked list.
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