Stack-Repo
/
data
/train
/rghvgrv
/Simple-Programs
/Data-Structure-and-Algorithms
/Java
/HashMap
/Median.java
| import java.io.*; | |
| import java.util.*; | |
| public class Median { | |
| public static class MedianPriorityQueue { | |
| PriorityQueue<Integer> left; | |
| PriorityQueue<Integer> right; | |
| public MedianPriorityQueue() { | |
| left = new PriorityQueue<>(Collections.reverseOrder()); | |
| right = new PriorityQueue<>(); | |
| } | |
| public void add(int val) { | |
| // write your code here | |
| if(right.size() >0 && val > right.peek()){ | |
| right.add(val); | |
| } | |
| else{ | |
| left.add(val); | |
| } | |
| if(left.size() - right.size()==2){ | |
| right.add(left.remove()); | |
| } | |
| else if(right.size() - left.size()==2){ | |
| left.add(riht.remove()); | |
| } | |
| } | |
| public int remove() { | |
| // write your code here | |
| if(this.size() == 0){ | |
| return -1; | |
| } | |
| else if(left.size() >= right.size()){ | |
| return left.remove(); | |
| } | |
| else{ | |
| return right.remove(); | |
| } | |
| } | |
| public int peek() { | |
| // write your code here | |
| if(this.size() == 0){ | |
| return -1; | |
| } | |
| else if(left.size() >= right.size()){ | |
| return left.peek(); | |
| } | |
| else{ | |
| return right.peek(); | |
| } | |
| } | |
| public int size() { | |
| // write your code here | |
| return left.size()+right.size(); | |
| } | |
| } | |
| public static void main(String[] args) throws Exception { | |
| BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | |
| MedianPriorityQueue qu = new MedianPriorityQueue(); | |
| String str = br.readLine(); | |
| while (str.equals("quit") == false) { | |
| if (str.startsWith("add")) { | |
| int val = Integer.parseInt(str.split(" ")[1]); | |
| qu.add(val); | |
| } else if (str.startsWith("remove")) { | |
| int val = qu.remove(); | |
| if (val != -1) { | |
| System.out.println(val); | |
| } | |
| } else if (str.startsWith("peek")) { | |
| int val = qu.peek(); | |
| if (val != -1) { | |
| System.out.println(val); | |
| } | |
| } else if (str.startsWith("size")) { | |
| System.out.println(qu.size()); | |
| } | |
| str = br.readLine(); | |
| } | |
| } | |
| } | |