linked list stack java questions csci quiz

Linked list stack java questions csci quiz software#

Rearrange positive and negative values in an array.First non-repeating integers in an array.Find the second minimum element of an array.Size - Gets the total number of elements in an array.Delete - Deletes an element at a given index.Get - Returns the element at a given index.

Insert - Inserts an element at a given index.Multi-dimensional arrays (arrays within arrays).One-dimensional arrays (as shown above).The following are the two types of arrays:

The majority of languages define the starting index of the array as 0. Here’s an image of a simple array of size 4, containing elements (1, 2, 3 and 4).Įach data element is assigned a positive numerical value called the Index, which corresponds to the position of that item in the array. Other data structures like stacks and queues are derived from arrays.

Tries (they are effectively trees, but it’s still good to call them out separately).Īn array is the simplest and most widely used data structure.

Let’s first list the most commonly used data structures, and then we’ll cover them one by one: We have a handful of data structures that cover our need to store data in different formats. No matter what problem are you solving, in one way or another you have to deal with data - whether it’s an employee’s salary, stock prices, a grocery list, or even a simple telephone directory.īased on different scenarios, data needs to be stored in a specific format. Why do we need Data Structures?Īs data structures are used to store data in an organized form, and since data is the most crucial entity in computer science, the true worth of data structures is clear. Your goal is to understand data structures so that you can pick the data structure that’s most optimal for the problem at hand. This “layout” allows a data structure to be efficient in some operations and inefficient in others. Simply put, a data structure is a container that stores data in a specific layout. Let’s start with understanding the basics. Learning data structures is essential even if you’re just trying to get better at your current job.

Sometimes interview questions explicitly mention a data structure, for example, “given a binary tree.” Other times it’s implicit, like “we want to track the number of books associated with each author.” It doesn’t matter whether you have just graduated (from a university or coding bootcamp), or you have decades of experience.

Linked list stack java questions csci quiz software#

That’s why software engineering candidates have to demonstrate their understanding of data structures along with their applications.Īlmost all problems require the candidate to demonstrate a deep understanding of data structures. Niklaus Wirth, a Swiss computer scientist, wrote a book in 1976 titled Algorithms + Data Structures = Programs.Ĥ0+ years later, that equation still holds true.