Priority Queue Using Heap

 https://www.codesdope.com/blog/article/priority-queue-using-heap/

https://www.codesdope.com/course/algorithms-introduction/

https://www.codesdope.com/course/data-structures-introduction/

http://web.eecs.utk.edu/~leparker/Courses/CS302-Fall06/Lecture_notes/09-26-Priority-queues-1.pdf

https://sites.fas.harvard.edu/~libs111/files/lectures/unit9-3.pdf