#include <bits/stdc++.h>
using namespace std;
 
int main() {
	// priority_queue 
	// push 
	// size 
	// top pop empty 
	priority_queue<int> pq;
	pq.push(1); 
	pq.push(5); 
	pq.push(2); 
	pq.push(6); 
 
	cout << pq.top(); // print 6 
	cout << endl;
	pq.pop(); 
	cout << pq.top(); // print 5 
	cout << endl;
 
	priority_queue<pair<int,int>> pq2;
	pq2.push({1, 5}); 
	pq2.push({1, 6}); 
	pq2.push({1, 7}); 
	cout << pq2.top().first << " " << pq2.top().first << endl;
 
	return 0;
}
 

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