HDU 4006 优先队列

The kth great number

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65768/65768 K (Java/Others)
Total Submission(s): 10390    Accepted Submission(s): 4153

Problem Description

Xiao Ming and Xiao Bao are playing a simple Numbers game. In a round Xiao Ming can choose to write down a number, or ask Xiao Bao what the kth great number is. Because the number written by Xiao Ming is too much, Xiao Bao is feeling giddy. Now, try to help Xiao Bao.

 

 

Input

There are several test cases. For each test case, the first line of input contains two positive integer n, k. Then n lines follow. If Xiao Ming choose to write down a number, there will be an " I" followed by a number that Xiao Ming will write down. If Xiao Ming choose to ask Xiao Bao, there will be a "Q", then you need to output the kth great number.

 

 

Output

The output consists of one integer representing the largest number of islands that all lie on one line.

 

 

Sample Input

8 3

I 1

I 2

I 3

Q

I 5

Q

I 4

Q

 

 

Sample Output

1

2

3

Hint

Xiao Ming won't ask Xiao Bao the kth great number when the number of the written number is smaller than k. (1=<k<=n<=1000000).

 

 

Source

The 36th ACM/ICPC Asia Regional Dalian Site —— Online Contest

题意：

共有n种操作，I插入一个数，Q询问第K大的数是几。

代码：

学会了优先队列

#include<iostream>
#include<cstdio>
#include<cstring>
#include<queue>
#include<functional>
#include<vector>
using namespace std;
int n,k;
int main()
{
    char ch[5];
    int x;
    while(scanf("%d%d",&n,&k)!=EOF)
    {
        priority_queue<int,vector<int>,greater<int> >que;
        while(n--)
        {
            scanf("%s",ch);
            if(ch[0]=='I')
            {
                scanf("%d",&x);
                que.push(x);
            }
            else
            {
                printf("%d\n",que.top());
            }
            if(que.size()>k)
            que.pop();
        }
    }
    return 0;
}