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 C (judge verdict: Accepted)

#include <stdio.h>
#define ll long long

//*
//プラキュー（二分ヒープ）（最低限バージョン）
//int PQhikaku(int i,int j);//jの方が優先度が高いならtrueを返す
int PQhikaku(ll*heap,int i,int j){return heap[i]<heap[j];}
void heap_utod(ll*heap,int n){
	if(2*n>heap[0])return;
	int rflag=(2*n+1<=heap[0])&&(PQhikaku(heap,2*n,2*n+1));
	if(PQhikaku(heap,n,2*n+rflag)){
		ll temp=heap[2*n+rflag];
		heap[2*n+rflag]=heap[n];
		heap[n]=temp;
		heap_utod(heap,2*n+rflag);
	}
}
void heap_dtou(ll*heap,int n){
	if(n==1||PQhikaku(heap,n,n/2))return;
	ll temp=heap[n];
	heap[n]=heap[n/2];
	heap[n/2]=temp;
	heap_dtou(heap,n/2);
}
ll PQpop(ll*heap){
	ll rr=heap[1];
	heap[1]=heap[heap[0]--];
	heap_utod(heap,1);
	return rr;
}
void PQpush(ll*heap,ll n){
	heap[++heap[0]]=n;
	heap_dtou(heap,heap[0]);
}
//*/

ll a[2000010];

int main(){
	char s[10];
	while(scanf("%s",s),s[2]!='d'){
		if(s[0]=='i'){
			int t;
			scanf("%d",&t);
			PQpush(a,t);
		}else{
			printf("%d\n",PQpop(a));
		}
	}
}