HDU 5349 MZL's simple problem

Problem Description

A simple problem
Problem Description
You have a multiple set,and now there are three kinds of operations:
1 x : add number x to set
2 : delete the minimum number (if the set is empty now,then ignore it)
3 : query the maximum number (if the set is empty now,the answer is 0)

 

Input

The first line contains a number  N  ( N≤106 ),representing the number of operations.
Next  N  line ,each line contains one or two numbers,describe one operation.
The number in this set is not greater than  109 .

 

Output

For each operation 3,output a line representing the answer.

 

Sample Input

   
   
   
   

    
    
    
    6
1 2
1 3
3
1 3
1 4
3
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    3
4
   
   
   
   

 

简单题，注意最小值判断

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
#include<string>
#include<cmath>
#include<queue>
#include<vector>
#include<map>
#include<set>
using namespace std;
const int maxn = 60505;
int a, b, T, x;

int main()
{
	scanf("%d", &T);
	a = -0x7FFFFFFF; b = 0;
	while (T--)
	{
		scanf("%d", &x);
		if (x == 1) 
		{ 
			scanf("%d", &x);  
			if (x > a) a = x; 
			b++;
		}
		else if (x == 2) { 
			if (b) b--;
			if (!b) a = -0x7FFFFFFF;
		}
		else printf("%d\n", b ? a : b);
	}
	return 0;
}