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.
159
questions
4
votes
1answer
42 views
Heap insertion and deletion Implementation using Python
I have implemented basic max heap insertion and deletion functions without recursion
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1
vote
1answer
81 views
Priority Queue implementation for top k frequent elements leetcode in Ruby
While working on the following leetcode problem: https://leetcode.com/problems/top-k-frequent-elements/ I used a Priority Queu implementation in Ruby. I have learned how to implement a Priority Queu ...
3
votes
0answers
74 views
Another Min Heap implementation
I am having a look at Rust, this is the first data structure I have tried to implement ( the standard library has a max-heap implementation, so this is a learning exercise ).
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3
votes
2answers
67 views
Mergesort (using vectors) and some questions about memory
Back from a long C++ hiatus. I thought to implement mergesort from memory, using containers and not based on CLRS's pseudocode and arrays. The compiles and runs ok on the test cases.
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1
vote
0answers
59 views
Implement priority queue as min-heap in python
The standard library heapq in python doesn't support updating keys as a public method, which makes it hard to be used as a priority queue. Although the official ...
2
votes
0answers
47 views
Max Heap Implementation in Python
I decided to challenge myself to code this data structure by just seeing how it looks visually and this is what I got. I can change this easily to minheap by changing some greater than (>) operators. ...
2
votes
0answers
60 views
Fibonacci Heap Implementation In Java
From my repository.
This is my first time implementing a Fibonacci Heap, and since it's pretty complicated (at least to me), I would like to check if it is all correct.
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4
votes
1answer
50 views
Min Heap Java Implementation
I have implemented a min heap and looking for a simpler solution.
Is there anyone for suggesting a simpler solution for this?
Thanks.
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-1
votes
2answers
237 views
Finding the k most frequent words in file in c++
I have written C++ code using trie and min-heap to find the k most frequent words. I want to review my code.
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4
votes
3answers
277 views
Min heap without recursion
The code reads in integer array from user input and builds a minimum heap via an iterative scheme.
Are there any edge cases in which this approach would fail?
For the following test case/command ...
1
vote
1answer
32 views
Heap selection sort in Javascript
I have (designed and) implemented this fancy sorting algorithm that combines natural runs in the input array with a heap data structure:
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4
votes
1answer
80 views
A heap queue in Dyalog APL
I am learning Dyalog APL. I implemented a binary heap, which seems to work. How could I make it look more like APL (and less like Python)?
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1
vote
0answers
29 views
Making a priority queue using a Heap. Without using queue or heapq
I have to implement a priority queue using a heap without any library / package for priority queue or heap. I made a BinHeap class which is a min heap, and I made a priority queue class with enqueque, ...
0
votes
0answers
43 views
LeetCode: Sliding Window Median C# Minheap + MaxHeap
https://leetcode.com/problems/sliding-window-median/
Please review for performance. and coding style, no need to review the max and min heaps.
median is the mean of the two middle value.
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11
votes
5answers
1k views
Generic Heap Implementation in C#
This has been done a thousand times on here already, but here's another binary heap implementation. The implementation is generic in terms of heap elements, allows for injection of any type of ...
2
votes
1answer
81 views
Optimizing minHeap implementation
I have implemented a java class for minHeap but it is not working as fast as I want . I want some help to change it to work faster in insertion or deleting the minimum node.
Here is my implementation:...
2
votes
1answer
71 views
Basic LinkedList implementation [closed]
Please bear in mind, I've only started learning c++ this week, and as such, would love topic suggestions for which I should master, to become better at C++.
Below, is my code for a singly linkedlist. ...
1
vote
0answers
100 views
Binary Heap module in Typescript/Javascript supporting min-heap and max-heap
About binary heaps: https://en.wikipedia.org/wiki/Binary_heap
The purpose of this module is to allow quick and efficient priority queue management, compared to linked list.
Efficiency: insert: \$O(\...
0
votes
1answer
84 views
My implementation of binary heap
I made my custom heap, that allow to change and delete elements.
Please review it and tell me about any found bugs: https://bitbucket.org/nshatokhin/priorityqueue/src/master/
Is this implementation ...
4
votes
1answer
288 views
Min Heap Tree Implementation in python 3
I wrote a min-heap using a binary tree. How can I improve the time complexity of insert and delete function to be \$\mathcal{O}(log(n))\$?
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4
votes
1answer
101 views
LeetCode: Merge k sorted lists C#
https://leetcode.com/problems/merge-k-sorted-lists/
Merge k sorted linked lists and return it as one sorted list. Analyze
and describe its complexity.
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4
votes
1answer
246 views
Min Heap Priority Queue
This was a part of one an assignment I found online and tried to solve it myself.
The objective was to implement a Priority Queue using Min Heap and use Array as the underlying data structure to ...
5
votes
1answer
282 views
Implementing d-ary heap
I'm trying to Implement a d-ary heap.
A d-ary heap is just like a regular heap but instead of two childrens to each element, there are d childrens!
d is given when building a heap, either by giving an ...
4
votes
2answers
121 views
Min Heap implementation [C++]
I've never had my C++ code reviewed before so I'd appreciate any feedback. Although my main focus was not on the implementation of the algorithm itself, any suggestions regarding improving it would be ...
4
votes
0answers
99 views
Generic Macro Generated Interval Heap in C
When I saw this amazing data structure I couldn't stop myself from trying it! I first sought resources such as this and an article about it here. It basically works as a Max-Heap and a Min-Heap at the ...
1
vote
0answers
161 views
Max-Heap Implementation in Kotlin
I am concerned about a few things about my heap implementation. This is in Kotlin.
For starters-
When and when not to use expressions?
The use of also to swap ...
7
votes
1answer
513 views
LeetCode: last stone weight C#
https://leetcode.com/problems/last-stone-weight/
We have a collection of rocks, each rock has a positive integer
weight.
Each turn, we choose the two heaviest rocks and smash them together.
...
3
votes
1answer
237 views
LeetCode: Minimum cost to hire k workers
https://leetcode.com/problems/minimum-cost-to-hire-k-workers/
There are N workers. The i-th worker has a quality[i] and a minimum
wage expectation wage[i].
Now we want to hire exactly K workers to ...
6
votes
3answers
4k views
4
votes
1answer
98 views
Overriding List subscription to create IndexedHeap for Classical Dijkstra's Algorithm
Much of the academic exposition of Dijkstra's Algorithm (such as Wikipedia, or this class page from Darmouth) relies on your priority queue having the ability decrease the key of an entry: the ...
7
votes
1answer
204 views
Binary Heap implementation in Common Lisp and tests
I implemented a basic binary heap in Common Lisp to learn programming using the CLOS. It is quite neat and self-contained, the core of the program is about 100 SLOC. The whole repository can be found ...
4
votes
1answer
818 views
Min heap C++ implementation
I have implemented a min heap in C++, and I want to improve it in every possible way. Could you please review it and let me know your suggestions/comments?
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5
votes
3answers
191 views
Repeatedly keep removing 2 smallest elements and add its sum back to the list and return newly inserted elements' total
I have a list of unsorted numbers. Each time, I need to remove 2 smallest numbers and insert back its sum into the list. Repeatedly do this till the 1 final element is remaining in the list.
Return ...
5
votes
1answer
160 views
C++11 min-heap with configurable arity
Here is a simple heap implementation that allows the heap arity to be chosen at compile time, including the degenerate case where n=1 and the heap is effectively a sorted array with a terrible repair ...
1
vote
0answers
459 views
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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3
votes
0answers
45 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....
3
votes
1answer
82 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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3
votes
2answers
283 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 ...
1
vote
1answer
31 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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4
votes
2answers
108 views
1
vote
2answers
1k 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? ...
5
votes
1answer
183 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...
10
votes
1answer
309 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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6
votes
1answer
919 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. ...
6
votes
2answers
311 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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1
vote
1answer
366 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 ...
8
votes
4answers
458 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, ...
8
votes
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 ...
2
votes
0answers
727 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:
...
17
votes
1answer
16k 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)
...
