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Double ended priority queue in C++ Program
In this tutorial, we are going to create a double-ended priority queue using the set in c++.
Let's see the steps to create a double-ended queue.
Create a struct with a name as you wish.
Create a variable for the queue using the set.
size method that returns the size of the queue.
is_empty method that returns whether the queue is empty or not.
insert method to insert a new element into the queue.
get_start method that returns an element from the left side of the queue.
get_end method that returns the element from the right side of the queue.
delete_start method that deletes the first element from the left side.
delete_end method deletes the first element from the right side.
Example
Let's see the code.
#include <bits/stdc++.h>
using namespace std;
struct doubleEndedQueue {
set<int> s;
int size() {
return s.size();
}
string is_empty() {
return s.size() == 0 ? "True" : "False";
}
void insert(int x) {
s.insert(x);
}
int get_start() {
return *(s.begin());
}
int get_end() {
return *(s.rbegin());
}
void delete_start() {
if (s.size() == 0) {
return;
}
s.erase(s.begin());
}
void delete_end() {
if (s.size() == 0) {
return;
}
auto end = s.end();
end--;
s.erase(end);
}
};
int main() {
doubleEndedQueue d;
cout << "is empty: " << d.is_empty() << endl;
d.insert(1);
d.insert(2);
d.insert(3);
d.insert(4);
d.insert(5);
cout << "is empty: " << d.is_empty() << endl;
cout << "end: " << d.get_end() << endl;
d.delete_end();
cout << "end: " << d.get_end() << endl;
cout << "start: " << d.get_start() << endl;
d.delete_start();
cout << "start: " << d.get_start() << endl;
return 0;
}Output
If you run the above code, then you will get the following result.
is empty: True is empty: False end: 5 end: 4 start: 1 start: 2
Conclusion
If you have any queries in the tutorial, mention them in the comment section.
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