How to use the priority queue STL for objects

class Person
{
public:
    int age;
};

I'd want to put objects of the type Person in a priority queue.

priority_queue< Person, vector<Person>, ??? >

I believe I need to declare a class for the comparison, but I'm not sure.

In addition, when we write,

priority_queue< int, vector<int>, greater<int> >

How does the greater work?

Jun 27, 2022 in C++ by Nicholas
• 7,760 points • 480 views

No answer to this question. Be the first to respond.

Your answer

Your name to display (optional):

Email me at this address if my answer is selected or commented on:

Privacy: Your email address will only be used for sending these notifications.

How to use std::sort to sort an array in C++

We receive std::begin and std::end in C++0x/11, which are overloaded for arrays: #include <algorithm> int main(){ int v[2000]; ...READ MORE

answered Jun 1, 2022 in C++ by Damon
• 4,960 points • 1,163 views

0 votes

1 answer

What is the best way to use a HashMap in C++?

The ordered and unordered map containers (std::map and std::unordered map) are included in the standard library. The items in an ordered map are sorted by key, and insert and access are in O (log n). For ordered maps, the standard library often use red black trees. However, this is only an implementation detail. Insert and access are in O in an unordered map (1). It is simply another term for a hashtable. An illustration using (ordered) std::map: #include <map> #include <iostream> #include <cassert> int main(int argc, char ...READ MORE

answered Jun 10, 2022 in C++ by Damon
• 4,960 points • 864 views

0 votes

1 answer

How to use new[ ] and delete[ ] operator in C++

int main(){ char *str; ...READ MORE

answered Jun 20, 2022 in C++ by Damon
• 4,960 points • 583 views

0 votes

1 answer

How to use enums in C++

This will be sufficient to declare your ...READ MORE

answered Jun 20, 2022 in C++ by Damon
• 4,960 points • 637 views

0 votes

1 answer

how could I use the power function in c/c++ without pow(), functions, or recursion

It is part of a series. Replace pow() with the previous iteration's value. There is no need for code to call pow (). Pow(x, 5 * I - 1) and pow(-1, I - 1) may be formed since both have an int exponent dependent on the iterator I from the previous loop iteration. Example: Let f(x, i) = pow(x, 5 * i ...READ MORE

answered Jun 21, 2022 in C++ by Damon
• 4,960 points • 2,536 views

0 votes

0 answers

How to use c++ swap function?

It is OK to write swap(a,b); There is an issue when I write swap(&c[0],&d[0]);. Can anyone explain why? #include<iostream> #include<algorithm> using namespace std; int main(void){ ...READ MORE