Windows Message Queue

標籤：

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

Total Submission(s): 4440    Accepted Submission(s): 1766

Problem DescriptionMessage 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. 
InputThere‘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. 
OutputFor 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

GETPUT msg1 10 5PUT msg2 10 4GETGETGET

 
Sample Output

EMPTY QUEUE!msg2 10msg1 10EMPTY QUEUE!

剛開始沒有考慮如果優先順序相等，要按輸入的先後順序輸出這種情況；

#include<stdio.h>#include<queue>using namespace std;struct stu{char name[20];int num;int number;int id;friend bool operator<(stu x,stu y){if(x.number==y.number)return x.id>y.id;return x.number>y.number;}};int main(){char a[50];struct stu b;int c=0; //priority_queue<int,vector<int>,greater<int> >q;priority_queue<stu> q;while(scanf("%s",a)!=EOF){if(a[0]=='G'){if(q.empty()){printf("EMPTY QUEUE!\n");}else {b=q.top();printf("%s %d\n",b.name,b.num);q.pop();}}else{scanf("%s%d%d",b.name,&b.num,&b.number);//q.push(b.number);//b.number=c;b.id=++c; //標記輸入的順序q.push(b);}}return 0;}

著作權聲明：本文為博主原創文章，未經博主允許不得轉載。

Windows Message Queue