# Write an algorithm for heap sort in data structure

Simplest programming tutorials for beginners What do you want to learn today? ## HeapSort ( array Based) implementation in Java ~ Code 2 Learn

This algorithm follows greedy algorithm approach. What is a Directed Acyclic Graph?

 Advantages - Radix Sort Though tree and graph are on the tough 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. What is a Heap ? If you want to practice and improve data structure and algorithm programs, this post will be very helpful to you. Heap property It divides the elements to be sorted into two groups, sorts the two groups by recursive calls, and combines the two sorted groups into a single array of sorted values. However, the method for dividing the array in half is much more sophisticated than the simple method we used for merge sort.

It does not contain any cycles in it. It is, therefore, a finite directed graph without any directed cycles. A DAG consists of many Edges and Vertices where each edge is directed from one vertex to another vertex. What is Topological Sorting Algorithm? The topological sorting algorithm is basically linear ordering of the vertices of the graph in a way that for every edge ab from vertex a to b, the vertex a comes before the vertex b in the topological ordering.

In other words, the topological sorting of a Directed Acyclic Graph is linear ordering of all of its vertices. The sequence of vertices in linear ordering is known as topological sequence or topological order. There may be more than one topological sequences for a given graph.

## Introduction

Topological Sort is also sometimes known as Topological Ordering. The topological sorting is possible only if the graph does not have any directed cycle. In other words, a topological ordering is possible only in acyclic graphs.

In other words, it is a vertex with Zero Indegree. Delete this vertex and all the outgoing edges from it. Repeat the above process till all the vertices are not deleted from the DAG.

Initially, calculate the indegree of all the vertices in the graph and the add the vertex with zero indegree vertices into the empty queue. The outgoing edges are then deleted and the indegrees of its successors are decreased by 1. A vertex is pushed into the queue through front as soon as its indegree becomes 0. Now, this process continues till all the vertices in the graph are not deleted.

If in between the topological sort algorithm process, a situation occurs where no vertex is left with zero indegree and all the vertices in the graph have predecessors, then it indicates that the graph is cyclic.Enhance your programming skill set by learning about some of the most commonly-used data structures and algorithms.

In this course, instructor Raghavendra Dixit walks through how to use Java to write code to implement data structures and algorithms. A binary heap is a heap a data structure created using a binary tree. It can be seen as a binary tree with two additional constraints: The shape property: the tree is an almost complete binary tree; that is, all levels of the tree, except possibly the last one (deepest) are fully filled, and, if the last level of the tree is not complete, the nodes of that level are filled from left to right.

In advanced implementation however, we have an efficient method for representing a heap (complete binary tree) in an array and thus do not need an extra data structure to hold the heap.

Let's try the algorithm with the following binary heap stored in an array: 45, 27, 42, 21, 23, 22, 35, 19, 4, and 5.

## Points of Interest

In this article we will see how to perform Min-Heap and Max-Heap using Priority Queue. Brief: A priority queue is an abstract data type where each element has a “priority” assigned to it.

In this algorithm the heap build is used to rebuild the heap. In this example we sorting all elements of an array. The complexity of the heap sort is O(heartoftexashop.com(n)) since the method buildheap takes time O(n) and each of the (n-1) calls to maxheap takes time O(lg n).

This sort of analysis described here is called asymptotic analysis, as it examines how the efficiency of a data structure changes as the data structure's size approaches infinity. The notation commonly used in asymptotic analysis is called big-Oh notation.

Bubble sort - Wikipedia