hdoj 1509 Windows Message Queue

张小象

于 2015-08-18 15:52:06 发布

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分类专栏：优先队列+STL 文章标签： Windows Message Queu hdoj 1509 优先队列队列 hdoj

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Windows Message Queue

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)

Total Submission(s): 4557 Accepted Submission(s): 1819

Problem Description

Message queue is the basic fundamental of windows system. For each process, the system maintains a message queue. If something happens to this process, such as mouse click, text change, the system will add a message to the queue. Meanwhile, the process will do a loop for getting message from the queue according to the priority value if it is not empty. Note that the less priority value means the higher priority. In this problem, you are asked to simulate the message queue for putting messages to and getting message from the message queue.

Input

There's only one test case in the input. Each line is a command, "GET" or "PUT", which means getting message or putting message. If the command is "PUT", there're one string means the message name and two integer means the parameter and priority followed by. There will be at most 60000 command. Note that one message can appear twice or more and if two messages have the same priority, the one comes first will be processed first.(i.e., FIFO for the same priority.) Process to the end-of-file.

Output

For each "GET" command, output the command getting from the message queue with the name and parameter in one line. If there's no message in the queue, output "EMPTY QUEUE!". There's no output for "PUT" command.

Sample Input

GET
PUT msg1 10 5
PUT msg2 10 4
GET
GET
GET

Sample Output

EMPTY QUEUE!
msg2 10
msg1 10
EMPTY QUEUE!

/*
本题大意：
短信有不同的优先级，参数，及msg，读取短信按照优先级读取，优先级相同，按照输入的顺序读 
*/
#include<stdio.h>
#include<queue>
#include<string.h>
#include<algorithm>
using namespace std;
struct qu
{
	int key;//输入的顺序 
	int yxj;//优先级 
	int num;//参数 
	char name[100];//短信中的字符 
    friend bool operator < (qu a,qu b)//优先队列，按排序方式 进行（前面的题意） 
	{
		if(a.yxj ==b.yxj )
		return a.key>b.key;
		return a.yxj>b.yxj;
	}
};
int main()
{
	int i,j,k=0;
	char s[100];
	qu lw;
	priority_queue<qu>q;
	while(scanf("%s",s)!=EOF)
	{
		if(s[0]=='G')
		{
			if(q.empty() )
			printf("EMPTY QUEUE!\n");
			else 
			{
				lw=q.top() ;
				printf("%s %d\n",lw.name ,lw.num );
				q.pop() ;
			}
		}
		else
		{
			scanf("%s%d%d",lw.name,&lw.num,&lw.yxj);
			lw.key =k++;
			q.push(lw);
		}
	}
	return 0;
}