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priority queue in c++

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Helpless Hippopotamus answered on November 26, 2020 Popularity 10/10 Helpfulness 4/10

answer priority queue in c++

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priority queue in c++

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//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;

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: Grepper

Tags: c++ priority-queue

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Contributed on Nov 26 2020

Helpless Hippopotamus

0 Answers Avg Quality 2/10

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priority queue c++

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/* 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();

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Apr 13 2021

BreadCode

0 Answers Avg Quality 2/10

priority queue c++

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priority_queue<int> pq;//this works like rank (e.g: rank=1 > rank=2)
//the lower the rank the higher is the priority
pq.push(3);
cout<<pq.top()<<endl;
cout<<pq.size()<<endl;
pq.pop();
if(pq.empty()){
  cout<<"priority queue is empty"<<endl;
}

priority_queue<int, vector<int>, greater<int>> pqr;
//this is the reverse priority queue
//this works like score the higher the score the more is it's priority
pqr.push(1);
pqr.push(4);
cout<<pqr.top()<<endl;
pqr.pop();
cout<<pqr.size()<<endl;
if(!pqr.empty()){
  cout<<"the priority queue is not empty"<<endl;
}

Popularity 10/10 Helpfulness 3/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Mar 07 2022

Weary Wolf

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priority queue in cpp

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// priority_queue::swap
#include <iostream>       // std::cout
#include <queue>          // std::priority_queue

int main ()
{
  std::priority_queue<int> foo,bar;
  foo.push (15); foo.push(30); foo.push(10);
  bar.push (101); bar.push(202);

  foo.swap(bar);

  std::cout << "size of foo: " << foo.size() << '\n';
  std::cout << "size of bar: " << bar.size() << '\n';

  return 0;
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: m.cplusplus.com

Tags: c++

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Contributed on May 23 2022

Alive Ant

0 Answers Avg Quality 2/10

priority queue c++

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Input: grid = [[0,2,1,0],[4,0,0,3],[1,0,0,4],[0,3,2,0]]
Output: 7
Explanation: The fisher can start at cell (1,3) and collect 3 fish, then move to cell (2,3) and collect 4 fish.

Popularity 10/10 Helpfulness 1/10 Language cpp

Source: leetcode.com

Tags: c++

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Contributed on Apr 30 2023

Busy Boar

0 Answers Avg Quality 2/10

priority queue in c++

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