zoj-2724 Windows Message Queue（二叉堆&&优先队列）

Windows Message Queue

Time Limit:2000MS     Memory Limit:65536KB 

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!

//二叉堆，小根堆//通过一维数组模拟实现//Memory 1812 KB    Time 50 ms#include<stdio.h>struct info{char mes[10];int time,pir,date;}f[60002];int heap[60002];bool compare(int a,int b){if(f[a].pir<f[b].pir) return false;if(f[a].pir>f[b].pir) return true;if(f[a].time<f[b].time) return false;return true;}int main(){int i,t,k,sum=0,time=0;char s[10];while(scanf("%s",s)!=EOF){if(s[0]=='G'){if(!sum) printf("EMPTY QUEUE!\n");else{printf("%s %d\n",f[heap[1]].mes,f[heap[1]].date);//输出根k=1;heap[1]=heap[sum--];//将队尾元素放到队首while(2*k<=sum){//与子节点中权值小的交换t=2*k;if(t<sum&&compare(heap[t],heap[t+1])) t++;//左右节点权值最小的if(compare(heap[k],heap[t])){i=heap[t];heap[t]=heap[k];heap[k]=i;k=t;}else break;}}}else{scanf("%s%d%d",f[time].mes,&f[time].date,&f[time].pir);f[time].time=time;heap[++sum]=time++;//记录位置k=sum;while(k>1){//权值小，向上冒泡t=k/2;if(compare(heap[t],heap[k])){i=heap[t];heap[t]=heap[k];heap[k]=i;k=t;}else break;}}}return 0;}

//优先队列//Memory 1240 KB   Time 40 ms#include<iostream>#include<stdio.h>#include<queue>using namespace std;struct node{int mes,pri;char c[10];friend bool operator < (const node &a,const node &b){return a.pri>b.pri;}};int main(){priority_queue<node> que;node a;char s[10];while(scanf("%s",s)!=EOF){if(s[0]=='G'){if(que.empty()) printf("EMPTY QUEUE!\n");else{a=que.top();que.pop();printf("%s %d\n",a.c,a.mes);}}else{scanf("%s%d%d",a.c,&a.mes,&a.pri);que.push(a);}}return 0;}