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LAST UPDATED: NOVEMBER 1, 2020

# C++ STL Priority Queue Program

Hello Everyone!

In this tutorial, we will learn about the working of Priority Queue, in the C++ programming language.

To understand the basic functionality of the Priority Queue in CPP, we will recommend you to visit C++ STL Priority Queue, where we have explained this concept in detail from scratch.

For a better understanding of its implementation, refer to the well-commented C++ code given below.

Code:

``````#include <iostream>
#include <bits/stdc++.h>

using namespace std;

//Function to print the elements of the Priority Queue
void show(priority_queue<int> q)
{
//Copying the Priority Queue into another to maintain the original Priority Queue
priority_queue<int> pq = q;

while (!pq.empty())
{
cout << "\t" << pq.top(); //printing the top most element
pq.pop();                 //deleting the top most element to move to the next
}

cout << endl;
}

int main()
{
cout << "\n\nWelcome to Studytonight :-)\n\n\n";
cout << " =====  Program to demonstrate the Implementation of Priority Queue, in CPP  ===== \n\n";

int i;

//Declaring a Priority Queue of integers
//Note: by default the priority queue is Max heap in c++
priority_queue<int> q;

//Filling the elements
cout << "Inserting elements into the Priority Queue\n\n";
for (i = 1; i < 6; i++)
{
q.push(i * 10);
}

cout << "The Priority Queue is: ";
show(q);

cout << "\n\nThe number of elements in the Priority Queue are : " << q.size();
;

cout << "\n\nThe first element or the element with the highest priority is: " << q.top();
;

cout << "\n\nAfter Deleting the top most element or the highest priority element from the Priority Queue, it becomes: ";
q.pop();
show(q);

cout << "\n\n\n";

return 0;
}
``````

Output:

We hope that this post helped you develop a better understanding of the concept of Priority Queue and its implementation in CPP. For any query, feel free to reach out to us via the comments section down below.

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