Problem:
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Priority Queue

A priority queue is a data structure which maintains a set $S$ of elements, each of with an associated value (key), and supports the following operations:

$insert(S, k)$: insert an element $k$ into the set $S$

$extractMax(S)$: remove and return the element of $S$ with the largest key

Write a program which performs the $insert(S, k)$ and $extractMax(S)$ operations to a priority queue $S$.
The priority queue manages a set of integers, which are also keys for the priority.

Input

Multiple operations to the priority queue $S$ are given. Each operation is given by "insert $k$", "extract" or "end" in a line. Here, $k$ represents an integer element to be inserted to the priority queue.

The input ends with "end" operation.

Output

For each "extract" operation, print the element extracted from the priority queue $S$ in a line.

Constraints

The number of operations $\leq 2,000,000$

$0 \leq k \leq 2,000,000,000$

Sample Input 1

insert 8
insert 2
extract
insert 10
extract
insert 11
extract
extract
end

Sample Output 1

8
10
11
2

Solution in JAVA (judge verdict: Accepted)

import java.io.*;
import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.StringTokenizer;
  
class Main{
  
static final PrintWriter out=new PrintWriter(System.out);

public static void main(String[] args) throws IOException{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
PriorityQueue<Integer> pque=new PriorityQueue<Integer>(10,new Comparator<Integer>(){
public int compare(Integer n1,Integer n2){
return n1>n2?-1:n1<n2?1:0;
}
});
int n;
while(true){
StringTokenizer st=new StringTokenizer(br.readLine());
String command=st.nextToken();
if("insert".equals(command)){
n=Integer.parseInt(st.nextToken());
pque.offer(n);
}
else if("end".equals(command)) break;
else out.println(pque.poll());
}
out.flush();
}
}