priority queue cpp

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showing results for - "priority queue cpp"
Tao
17 Aug 2019
1/* A priority queue maintains a set of elements. The supported operations are
2insertion and, depending on the type of the queue, retrieval and removal 
3of either the minimum or maximum element. Insertion and removal take 
4O(logn) time, and retrieval takes O(1) time. */
5priority_queue<int> q;
6q.push(3); // 3
7q.push(5); // 3 5
8q.push(7); // 3 5 7
9q.push(2); // 2 3 5 7
10cout << q.top() << "\n"; // 7
11q.pop();
12cout << q.top() << "\n"; // 5
13q.pop();
14q.push(6);
15cout << q.top() << "\n"; // 6
16q.pop();
Felipe
23 Jan 2021
1// using GCC 10.2 (C++2a) compiler
2#include <functional>
3#include <queue>
4#include <vector>
5#include <iostream>
6 
7template<typename T> void print_queue(T& q) {
8    while(!q.empty()) {
9        std::cout << q.top() << " ";
10        q.pop();
11    }
12    std::cout << '\n';
13}
14 
15int main() {
16    std::priority_queue<int> q;
17 
18    for(int n : {1,8,5,6,3,4,0,9,7,2})
19        q.push(n);
20 
21    print_queue(q);
22 
23    std::priority_queue<int, std::vector<int>, std::greater<int> > q2;
24 
25    for(int n : {1,8,5,6,3,4,0,9,7,2})
26        q2.push(n);
27 
28    print_queue(q2);
29 
30    // Using lambda to compare elements.
31    auto cmp = [](int left, int right) { return (left ^ 1) < (right ^ 1); };
32    std::priority_queue<int, std::vector<int>, decltype(cmp)> q3(cmp);
33 
34    for(int n : {1,8,5,6,3,4,0,9,7,2})
35        q3.push(n);
36 
37    print_queue(q3);
38 
39}
40
Leonardo
19 Apr 2018
1// Implementation of priority_queue in c++
2
3//queue with elements in decreasing order
4priority_queue<int> pq;
5
6// queue with elements in increasing order  using compare function inside declaration
7priority_queue <int, vector<int>, greater<int> > pq;
8
9//priority_queue of type pair<int, int>
10#define pp pair<int, int>
11priority_queue <pp, vector<pp>, greater<pp> > pq;
12
Cyndi
02 Apr 2019
1//Shubh'grepper
2// Implementation of priority_queue in c++
3
4//queue with elements in decreasing order
5priority_queue<int> pq;
6
7// queue with elements in increasing order  using compare function inside declaration
8priority_queue <int, vector<int>, greater<int> > pq;
9
10//priority_queue of type pair<int, int>
11#define pp pair<int, int>
12priority_queue <pp, vector<pp>, greater<pp> > pq;
13
Mazie
04 Oct 2016
1#include<iostream>
2#include<queue>
3#include<algorithm>
4
5using namespace std;
6
7int main()
8{
9    priority_queue<int>pq;
10    int n=5;
11    while(n--)
12    {
13        int val;
14        cout<<"enter the value you want to insert:"<<endl;
15        cin>>val;
16        pq.push(val);
17    }
18    priority_queue<int>p;
19    p.push(100);
20    p.push(1000);
21    p.push(3000);
22    p.push(5000);
23    pq.swap(p);
24    while(!pq.empty())
25    {
26        cout<<pq.top()<<" ";
27        pq.pop();
28    }
29    return 0;
30}
31
Arianna
23 Feb 2016
1/* Program to access an element of highest priority */
2 
3#include<iostream>
4#include<queue>     //Header-file for queue
5using namespace std;
6 
7 
8int main()
9{
10priority_queue<int> p1;
11p1.push(35);    
12p1.push(40);
13p1.push(95);
14p1.push(25);
15  
16cout<<p1.top();      //fetch element of highest
17priority(maximum element) i.e 95
18}
19
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