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Questions tagged [heap]

A heap is a tree-based data structure that satisfies the heap property. For questions about memory allocated from the system heap, use the [memory-management] tag.

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Max heap in Haskell

I wrote a (max) heap in Haskell which is balanced after every (public) operation. Not based on any documentation. Focus is on: speed, that is the right time-complexities (not necessarily optimal); ...
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32 views

Basic Qt5 UI with button [closed]

I have the following Qt class: mainwindow.h class MainWindow : public QWidget { Q_OBJECT QPushButton* m_button; public: explicit MainWindow(); }; mainwindow....
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1answer
33 views

Min Heap Implementation

Min Heap Implementation As an exercise, I wanted to implement a min heap using JavaScript. I'm not terribly familiar with JavaScript best practices, so I wanted to get feedback on my approach. ...
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2answers
150 views

RFC 1951 “Deflate” compression

This is a little project I did over Christmas, I wanted to understand a bit more about how RFC 1951 (https://www.ietf.org/rfc/rfc1951.txt) compression worked, mostly out of curiosity really. RFC 1951 ...
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1answer
28 views

Program to check if heap order is correct or not

There is a Java program to check if a Heap (Min) is in the correct order. Heap Order means the parent is less than both left child and right child. ...
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2answers
44 views

MaxHeap implementation in JavaScript

Here is MaxHeap implementation in pure JavaScript: ...
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2answers
39 views

Generic Min Heap Implementation in Java

There is a Min-Heap implementation in Java. BubbleUp() and BubbleDown() could have been coded using recursion but I prefer without recursion. Would there be a major difference if had used recursion? ...
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1answer
142 views

Maximum Heap Container

I implemented this max-heap to satisfy the C++ Container requirements. I am fairly confident I implemented bubble_up, bubble_down...
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1answer
211 views

Yet Another MinHeap

So, this has been done quite a few times on here, but each of the linked implementations has some significant issues. Since I needed a MinHeap anyway, I figured I would throw my version into the ring. ...
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1answer
184 views

Python 3 implementation of binary heap

Inspired by exercise on HackerRank where I'm expected to implement binary heap with additional method that allows to remove any value from heap I decided to clean up and expand my code a little. ...
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2answers
169 views

Binary heap implementation with a generic base class

This is my attempt at implementing a Binary heap. I made an abstract base class Heap with an abstract property controlling whether it is a min-heap or a max-heap. ...
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1answer
102 views

C++ heap CPS: Continuation Passing Style with Recursion

I am willing to see how to write readable and efficient continuations on the heap in c++. I am not quite satisfied. The following is just an exercise: it is coded for fun. I post the code here ...
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4answers
399 views

Binary Heap (list-based)

This is my first attempt at implementing a heap data structure and I've decided to cover the methods Peek, Pop, ...
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3answers
1k views

Heap implementation for numeric types

I am trying to improve the quality of my code as well as trying to study the Heap data structure. I have implemented a minHeap (Heap in which minimum value nodes ...
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269 views

Max Heap Data Structure Implemented with Python List

Created a max heap using a Python list as the base storage. The heap starts at index 1. Here is the heap: ...
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1answer
3k views

Min/Max Heap implementation in Python

I'm refreshing some of my datastructures. I saw this as the perfect opportunity to get some feedback on my code. I'm interested in: Algorithm wise: Is my implementation correct? (The tests say so) ...
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1answer
79 views

Purely functional brodal heap implementation

I implemented the Brodal heap from Brodal & Osaki 1996: Optimal Purely Functional Priority Queues in haskell. The paper gives an implementation in ML but without higher-kinded types. The goal was ...
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2answers
74 views

Operations on a heap

Introduction I started going through some basic algorithms as I'll have algorithms course next semester. The last time I've written any heap operations is around 5 years ago. This time around it took ...
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0answers
156 views

Implementing binary-heap in x86-64 assembly

I'm trying to implement some of the simplest classical data-structures in x86-64 assembly on linux. PRIMARY GOAL: Reduce memory consumption and increase performance (maybe using x86-64 architecture ...
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1answer
241 views

Optimisation suggestions for Min Heap

Can someone please optimisations for my implementation of min heap.Its performance is poor compared to the heapq module in python. My use case for the MinHeap class is 'N' insertions and extractions ...
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2answers
911 views

Binary Heap Implementation in Java

Here's my array-based binary heap java implementation, looking for comments / suggestions on my approach. I used a base heap class to contain most of the logic, since the behavior of min/max heaps is ...
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1answer
160 views
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0answers
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Comparing two heap sift algorithms in Java

My research question was to find out whether minimizing the number of assignments in a heap lead to any time savings. The "optimized" version stores the element to sift, sift the minimum to its place ...
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2answers
1k views

Min&Max Heap implementation in .NET

Overview I was doing some performance optimization patterns when I stumbled upon PriorityQueue and I implemented for that reason ...
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1answer
245 views

Binary heap (priority queue) implementation in JavaScript

I wrote this heap implementation because I need it to run Dijkstra's algorithm to find paths in a game (for which reason I'd like this implementation not to be unreasonably slow...) Sadly I don't ...
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1answer
125 views

Binary Heap Object

I wrote a basic binary heap object in python 3, and was wondering how it can be improved to be cleaner and more pythonic. ...
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0answers
800 views

Fibonacci heap in Python

I have this implementation of the Fibonacci heap in Python: ...
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1answer
354 views

Template heap/priority-queue data structure with update-key operation

I implemented the following priority-queue/heap with an update-key operation. The update key uses the map from STL, which still requires lg(n) time for lookup. ...
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1answer
2k views

Prim's Algorithm using heapq module in python

Implementing Prim's with a \$O(m\log n)\$ run time using heaps, similar to Dijkstra heap implementation. Where \$n\$ is the number of nodes, and \$m\$ is the number of edges. Using the ...
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360 views

Minimum Priority Queue using Heap

After getting suggestions for Maximum Priority Queue I have written program for Minimum Priority Queue. Help me improve this code. ...
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2answers
2k views

Maximum Priority Queue using Heap

I have written this program for Maximim Priority Queue after studying from Introduction to Algorithm . I want to improve my code. Is there any other method to implement Priority Queue instead of Heap? ...
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2answers
532 views

Finding the running median with 2 heaps [closed]

I am trying to solve running median problem in hackerrank https://www.hackerrank.com/challenges/ctci-find-the-running-median and below is my code ...
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1answer
2k views

C++ Dijkstra's shortest path implementation

I have created a c++ function that searches for the shortest path between two points with dijkstra's shortest path algorithmus. I'm using it right now in combination with a program that solves mazes ...
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3answers
910 views

Given some integers, return the k most frequent elements

Given a non-empty array of integers, return the k most frequent elements. For example, given [1,1,1,2,2,3] and k = 2, return <...
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1answer
404 views

Implementation of the Heap Sort algorithm in C++

I'm writing a little collection of sorting algorithms and some benchmarks (using Google benchmark). I wrote the following heap sort but I'm struggling in ...
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2answers
448 views

Select top 2 employees based on Grade and Alphabetical Order

Given a list of Employees ( name and grade). Output the names of the top 2 employees selected for a task(sorted based on grade and then alphabetically). I am using a maxHeap and override the ...
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3answers
44 views

Could this be considered a valid mergesort? [closed]

I tried to do a mergesort function for an assignment without importing merge from heapq: ...
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2answers
5k views

Min & Max heap implementation

As follows I have implemented Min and Max heap data structure, using an array for storing elements. I would need a code review, please. Please, spare recommendations for generic implementation as they ...
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2answers
999 views

Binary Min Heap data structure implementation

After reading about heap I tried to implement the heap. Below is my code along with test. Any feedback with respect to correctness, performance is welcome. ...
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1answer
761 views

Generic min heap in C++

I have recently started programming in C++. I have coded in MATLAB and C in the past. The following code implements a min heap as a generic class in C++. I would like to get some feedback on the ...
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3answers
239 views

k th smallest element in row wise and column wise sorted matrix

Find the kth smallest element in row wise and column wise sorted element: Example: matrix[row][col] < matrix[row+1][col] matrix[row][col] < matrix[row][col+1] mat= 1 ...
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1answer
46 views

Binary Heap Order Fixing in Java

I am implementing a binary heap in Java. I've come to the point where I have to fix the heap ordering whenever a new node is being inserted to the heap. The code below fixes the heap ordering. I have ...
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1answer
756 views

Sorting almost sorted array with a minimum heap

I'm currently looking into the quickest way to sort an almost sorted array: Given an array of \$n\$ elements, where each element is at most \$k\$ away from its target position, devise an ...
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1answer
1k views

Python Heap Implementation

I made this snippet for reviewing my DS textbook. Is it okay to write iterative loops in function _upheap and _downheap? Any ...
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1answer
7k views

Implementing heap in Python

This is basically a straightforward heap implementation. I am just moving from C to Python and I wanted to make sure that I follow Python's best practices in general. This heap is supposed to support ...
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2answers
1k views

C++11 (or C++14?) max heap implementation with a simple example

I've been writing C++03 non-professionally for a long time, and I finally started to play around with C++11 and C++14. I decided to try my hand at implementing a data structure that I was previously ...
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3answers
1k views

My own little memory manager in C

I have implemented a simple version of malloc() and its associated functions, free(), ...
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0answers
109 views

Finding the maximal bottleneck in a 2D matrix from source to destination

I recently started solving programming challenges and this one is causing me performance trouble. The problem statement is the following: You are given a 2d matrix where each cell contains an ...
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7answers
1k views

Binary Heap where a comparison delegate is used

I currently have a Generic Implementation of a BinaryHeap. It must be able to maintain it's integrity with elements that may or may not implement ...
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3answers
977 views

Sort Characters By Frequency

I solved this problem. Problem Statement Given a string, sort it in decreasing order based on the frequency of characters. Example 1 Input: "tree" Output: "eert" ...