Priority Queue in Java for Competitve Programming
In Java, the PriorityQueue class from the java.util package provides a convenient way to implement a Priority Queue for competitive programming. Here’s a guide on using PriorityQueue in Java:
Import Necessary Package:
import java.util.PriorityQueue;
Below are the Initialization and methods of PriorityQueue in Java:
Initialization and Methods | Initialization Max Heap (default) | Initialization Min Heap |
---|---|---|
Initialization | PriorityQueue<Integer> maxHeap = new PriorityQueue<>(); |
PriorityQueue<Integer> minHeap = new PriorityQueue<>(Comparator.naturalOrder()); |
Inserting Elements | maxHeap.add(5); |
minHeap.add(5); |
Accessing Top Element | int topElement = maxHeap.peek(); |
int topElement = minHeap.peek(); |
Removing Top Element | maxHeap.poll(); |
minHeap.poll(); |
Size and Empty Check | int size = maxHeap.size(); <br>boolean isEmpty = maxHeap.isEmpty(); |
int size = minHeap.size(); <br>boolean isEmpty = minHeap.isEmpty(); |
Custom Comparator in Priority Queue in Java :
We can use a custom comparator to implement a priority queue with specific ordering rules.
Heap Data Structure for Competitive Programming
Competitive programming needs smart tools to solve problems quickly. One key tool is the Heap Data Structure, which helps organize data in a way that’s super fast. In this article, we’ll break down the Heap, looking at its types, basic moves, and how it’s a big deal in competitive programming. We’ll focus on something called Priority Queue, a special use of Heap, and show you how to use it to solve problems better. It does not matter if you are new to Heap or if you have a little knowledge already, learning it will greatly enhance your problem-solving skills in competitive programming.
Table of Content
- Introduction to Heap Data Structure
- Types of Heap Data Structure
- Operations of Heap Data Structure
- What is Priority Queue?
- Priority Queue in C++ for Competitve Programming
- Priority Queue in Java for Competitve Programming
- Priority Queue in Python for Competitve Programming
- Problem Identification of Priority Queue
- Priority Queue Use Cases in Competitive Programming
- Practice Problems of Heap Data Structure for Competitive Programming