"priority queue c++" Code Answer's
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min heap priority queue c++
Cheerful Chipmunk
on May 22, 2020
#include<queue>
std::priority_queue <int, std::vector<int>, std::greater<int> > minHeap; priority queue c++
BreadCode
on Apr 13, 2021
/* A priority queue maintains a set of elements. The supported operations are
insertion and, depending on the type of the queue, retrieval and removal
of either the minimum or maximum element. Insertion and removal take
O(logn) time, and retrieval takes O(1) time. */
priority_queue<int> q;
q.push(3); // 3
q.push(5); // 3 5
q.push(7); // 3 5 7
q.push(2); // 2 3 5 7
cout << q.top() << "\n"; // 7
q.pop();
cout << q.top() << "\n"; // 5
q.pop();
q.push(6);
cout << q.top() << "\n"; // 6
q.pop();implemetation of priority queue in c++
Helpless Hippopotamus
on Nov 26, 2020
// Implementation of priority_queue in c++
//queue with elements in decreasing order
priority_queue<int> pq;
// queue with elements in increasing order using compare function inside declaration
priority_queue <int, vector<int>, greater<int> > pq;
//priority_queue of type pair<int, int>
#define pp pair<int, int>
priority_queue <pp, vector<pp>, greater<pp> > pq;
priority queue cpp
a literal child
on Oct 20, 2020
// using GCC 10.2 (C++2a) compiler
#include <functional>
#include <queue>
#include <vector>
#include <iostream>
template<typename T> void print_queue(T& q) {
while(!q.empty()) {
std::cout << q.top() << " ";
q.pop();
}
std::cout << '\n';
}
int main() {
std::priority_queue<int> q;
for(int n : {1,8,5,6,3,4,0,9,7,2})
q.push(n);
print_queue(q);
std::priority_queue<int, std::vector<int>, std::greater<int> > q2;
for(int n : {1,8,5,6,3,4,0,9,7,2})
q2.push(n);
print_queue(q2);
// Using lambda to compare elements.
auto cmp = [](int left, int right) { return (left ^ 1) < (right ^ 1); };
std::priority_queue<int, std::vector<int>, decltype(cmp)> q3(cmp);
for(int n : {1,8,5,6,3,4,0,9,7,2})
q3.push(n);
print_queue(q3);
}
Source: en.cppreference.com
priority queue in c++
Helpless Hippopotamus
on Nov 26, 2020
//Shubh'grepper
// Implementation of priority_queue in c++
//queue with elements in decreasing order
priority_queue<int> pq;
// queue with elements in increasing order using compare function inside declaration
priority_queue <int, vector<int>, greater<int> > pq;
//priority_queue of type pair<int, int>
#define pp pair<int, int>
priority_queue <pp, vector<pp>, greater<pp> > pq;
priority queue stl
ujjwal sotra
on Jun 06, 2021
#include<iostream>
#include<queue>
#include<algorithm>
using namespace std;
int main()
{
priority_queue<int>pq;
int n=5;
while(n--)
{
int val;
cout<<"enter the value you want to insert:"<<endl;
cin>>val;
pq.push(val);
}
priority_queue<int>p;
p.push(100);
p.push(1000);
p.push(3000);
p.push(5000);
pq.swap(p);
while(!pq.empty())
{
cout<<pq.top()<<" ";
pq.pop();
}
return 0;
}
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