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Priority Queue Element

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Javasper answered on March 16, 2022 Popularity 10/10 Helpfulness 1/10

answer Priority Queue Element

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Priority Queue Element

Comment

class QElement:
    def __init__(self, element, priority):
        self.element = element
        self.priority = priority

Popularity 10/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: element priority-queue python

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Contributed on Jul 25 2022

Javasper

0 Answers Avg Quality 2/10

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priority queue costom

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//custom structure and lambda function for custom priority_queue
struct Pii {
    int x, y, z;
    Pii(int a, int b, int c) : x(a), y(b), z(c) {}
};
int main()
{
	
	auto comparePii =  [](Pii a, Pii b){
        return a.x > b.x;
    };
    priority_queue<Pii, vector<Pii>, decltype(comparePii)> minHeap(comparePii);
    
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Feb 25 2024

subham

0 Answers Avg Quality 2/10

Priority Queues

Comment

For priority queues, each element in the queue has a priority property and these elements are ordered according to the priority property.

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: whatever whateve

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Contributed on Jul 12 2022

Javasper

0 Answers Avg Quality 2/10

priority queue

Comment

import java.util.PriorityQueue;
PriorityQueue<Integer> pq = new PriorityQueue<>();
pq.add();
pq.size();
pq.peek();//read
pq.poll();//read and remove
pq.remove();//remove

Popularity 10/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java

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Contributed on Aug 12 2022

anand agarwal

0 Answers Avg Quality 2/10

priority queue

Comment

const top = 0;
const parent = i => ((i + 1) >>> 1) - 1;
const left = i => (i << 1) + 1;
const right = i => (i + 1) << 1;

class PriorityQueue {
  constructor(comparator = (a, b) => a > b) {
    this._heap = [];
    this._comparator = comparator;
  }
  size() {
    return this._heap.length;
  }
  isEmpty() {
    return this.size() == 0;
  }
  peek() {
    return this._heap[top];
  }
  push(...values) {
    values.forEach(value => {
      this._heap.push(value);
      this._siftUp();
    });
    return this.size();
  }
  pop() {
    const poppedValue = this.peek();
    const bottom = this.size() - 1;
    if (bottom > top) {
      this._swap(top, bottom);
    }
    this._heap.pop();
    this._siftDown();
    return poppedValue;
  }
  replace(value) {
    const replacedValue = this.peek();
    this._heap[top] = value;
    this._siftDown();
    return replacedValue;
  }
  _greater(i, j) {
    return this._comparator(this._heap[i], this._heap[j]);
  }
  _swap(i, j) {
    [this._heap[i], this._heap[j]] = [this._heap[j], this._heap[i]];
  }
  _siftUp() {
    let node = this.size() - 1;
    while (node > top && this._greater(node, parent(node))) {
      this._swap(node, parent(node));
      node = parent(node);
    }
  }
  _siftDown() {
    let node = top;
    while (
      (left(node) < this.size() && this._greater(left(node), node)) ||
      (right(node) < this.size() && this._greater(right(node), node))
    ) {
      let maxChild = (right(node) < this.size() && this._greater(right(node), left(node))) ? right(node) : left(node);
      this._swap(node, maxChild);
      node = maxChild;
    }
  }
}

Popularity 9/10 Helpfulness 1/10 Language whatever

Source: stackoverflow.com

Tags: priority-queue prio

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Contributed on Jun 23 2023

Tame Tern

0 Answers Avg Quality 2/10

Priority Queue

Comment

/*PriorityQueue is an abstract data type that can be implemented in many different ways*/
class PriorityQueue{
    constructor()
    {
    this.items   = []        
    }
  
  
  enqueue(element, priority)
{
var qElement = new QElement(element, priority);
var contains = false;

/*check if element already in the items array*/
/*then check what position the element should be added*/
/*when an element is higher priority, add new element one position behind it*/
for (var i=0; i<this.items.length; i++)
{
if(this.items[i].priority > qElement.priority)
{
this.items.splice(i, 0, qElement);
contains = true;
break
}
}

if(!contains)
  {
this.items.push(qElement);
    }
  
  
}/*enqueue*/

  dequeue()
{
if(this.isEmpty())
{
return “Underflow”
}
return this.items.shift();

}
  
  front()
{

if (this.isEmpty())

return “No elements in Queue”;

return this.items[0];

}
  
  isEmpty()
  {
  return this.items == 0;
  }
  
  printPQueue()
{
  var str = "";
  for(var i =0; i<this.items.length; i++)
  {
    str += this.items[i].element + " ";
  }
  return str;
  

  
}
  
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 25 2022

Javasper

0 Answers Avg Quality 2/10

Priority Queue

Comment

// Priority Queue implementation in C

#include <stdio.h>
int size = 0;
void swap(int *a, int *b) {
  int temp = *b;
  *b = *a;
  *a = temp;
}

// Function to heapify the tree
void heapify(int array[], int size, int i) {
  if (size == 1) {
    printf("Single element in the heap");
  } else {
    // Find the largest among root, left child and right child
    int largest = i;
    int l = 2 * i + 1;
    int r = 2 * i + 2;
    if (l < size && array[l] > array[largest])
      largest = l;
    if (r < size && array[r] > array[largest])
      largest = r;

    // Swap and continue heapifying if root is not largest
    if (largest != i) {
      swap(&array[i], &array[largest]);
      heapify(array, size, largest);
    }
  }
}

// Function to insert an element into the tree
void insert(int array[], int newNum) {
  if (size == 0) {
    array[0] = newNum;
    size += 1;
  } else {
    array[size] = newNum;
    size += 1;
    for (int i = size / 2 - 1; i >= 0; i--) {
      heapify(array, size, i);
    }
  }
}

// Function to delete an element from the tree
void deleteRoot(int array[], int num) {
  int i;
  for (i = 0; i < size; i++) {
    if (num == array[i])
      break;
  }

  swap(&array[i], &array[size - 1]);
  size -= 1;
  for (int i = size / 2 - 1; i >= 0; i--) {
    heapify(array, size, i);
  }
}

// Print the array
void printArray(int array[], int size) {
  for (int i = 0; i < size; ++i)
    printf("%d ", array[i]);
  printf("\n");
}

// Driver code
int main() {
  int array[10];

  insert(array, 3);
  insert(array, 4);
  insert(array, 9);
  insert(array, 5);
  insert(array, 2);

  printf("Max-Heap array: ");
  printArray(array, size);

  deleteRoot(array, 4);

  printf("After deleting an element: ");

  printArray(array, size);
}

Popularity 10/10 Helpfulness 1/10 Language c

Source: www.programiz.com

Tags: c

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Contributed on Oct 16 2022

DarkDevilor

0 Answers Avg Quality 2/10

Priority Queue Element

Comment

class QElement{
    constructor(element, priority)
    {
        this.element = element;
        this.priority = priority;   
    }
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: element

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Contributed on Jul 25 2022

Javasper

0 Answers Avg Quality 2/10

priority queue

Comment

// C++ program for the above approach
 
#include <bits/stdc++.h>
using namespace std;
 
// Structure for the elements in the
// priority queue
struct item {
    int value;
    int priority;
};
 
// Store the element of a priority queue
item pr[100000];
 
// Pointer to the last index
int size = -1;
 
// Function to insert a new element
// into priority queue
void enqueue(int value, int priority)
{
    // Increase the size
    size++;
 
    // Insert the element
    pr[size].value = value;
    pr[size].priority = priority;
}
 
// Function to check the top element
int peek()
{
    int highestPriority = INT_MIN;
    int ind = -1;
 
    // Check for the element with
    // highest priority
    for (int i = 0; i <= size; i++) {
 
        // If priority is same choose
        // the element with the
        // highest value
        if (highestPriority
                == pr[i].priority
            && ind > -1
            && pr[ind].value
                   < pr[i].value) {
            highestPriority = pr[i].priority;
            ind = i;
        }
        else if (highestPriority
                 < pr[i].priority) {
            highestPriority = pr[i].priority;
            ind = i;
        }
    }
 
    // Return position of the element
    return ind;
}
 
// Function to remove the element with
// the highest priority
void dequeue()
{
    // Find the position of the element
    // with highest priority
    int ind = peek();
 
    // Shift the element one index before
    // from the position of the element
    // with highest priority is found
    for (int i = ind; i < size; i++) {
        pr[i] = pr[i + 1];
    }
 
    // Decrease the size of the
    // priority queue by one
    size--;
}
 
// Driver Code
int main()
{
    // Function Call to insert elements
    // as per the priority
    enqueue(10, 2);
    enqueue(14, 4);
    enqueue(16, 4);
    enqueue(12, 3);
 
    // Stores the top element
    // at the moment
    int ind = peek();
 
    cout << pr[ind].value << endl;
 
    // Dequeue the top element
    dequeue();
 
    // Check the top element
    ind = peek();
    cout << pr[ind].value << endl;
   
      // Dequeue the top element
    dequeue();
   
      // Check the top element
    ind = peek();
    cout << pr[ind].value << endl;
 
    return 0;
}

Popularity 10/10 Helpfulness 1/10 Language whatever

Source: www.geeksforgeeks.org

Tags: priority-queue prio

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Contributed on Mar 16 2022

Motionless Mink

0 Answers Avg Quality 2/10

Priority Queue Element

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