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Hello.java package demo; import java.util.ArrayList; import java.util.List; import java.util.Map; public class Hello { public static void main(String[] args) { System.out.println("Hello World"

https://www.techiedelight.com/introduction-priority-queues-using-binary-heaps/ https://www.techiedelight.com/min-heap-max-heap-implementation-in-java/