Data Structures

Data Structures

Data Structures – Linked List

What is Linked List? A linked list is a linear data structure where each element is a separate object. Each element (we will call it a node) of a list is comprising of two items – the data and a reference to the next node. The last node has a reference to null. The entry point into a linked list is called the head of the list. It should be noted that head is not a separate node, but the reference to the first node. If the list is empty then the head is a null reference. A linked list is a dynamic data structure. The number of nodes in a list is not fixed and can grow and shrink on demand. Any application which has to deal with an unknown number of objects will need to use a linked list. Types of Linked list: Singly linked list. Doubly linked list. Circular linked list. where last nod...

Data Structures – Array

What is an Array? An array is collection of items stored at contiguous memory locations. The idea is to store multiple items of same type(Homogeneous) together. This makes it easier to calculate the position of each element by simply adding an offset to a base value, i.e., the memory location of the first element of the array (generally denoted by the name of the array). What is Contiguous Memory? Contiguous memory allocation is a classical memory allocation model that assigns a process consecutive memory blocks (that is, memory blocks having consecutive addresses). Contiguous memory allocation is one of the oldest memory allocation schemes. When a process needs to execute, memory is requested by the process. The size of the process is compared with the amount of contiguous main memory ava...

Introduction to Data Structures

Definition: Simple definition of Data structure is organizing the data in memory. It is a systematic way to organize data in order to use it efficiently. There are different ways to organize data in structure. One example is Array. Array is collection of elements i.e., collection of memory locations, it is the memory locations that we store the values. In the array, structure of data is sequential it occupies contiguous memory locations types of data structures. Type Description Linear In Linear data structures, the data items are arranged in a linear sequence. Example: Array Non-Linear In Non-Linear data structures, the data items are not in sequence. Example: Tree, Graph Homogeneous In homogeneous data structures, all the elements are of same type. Example: Array Non-Homogeneous In Non-H...

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