uva540（队列）

  Team Queue 

Queues and Priority Queues are data structures which are known to most computer scientists. The Team Queue, however, is not so well known, though it occurs often in everyday life. At lunch time the queue in front of the Mensa is a team queue, for example.

In a team queue each element belongs to a team. If an element enters the queue, it first searches the queue from head to tail to check if some of its teammates (elements of the same team) are already in the queue. If yes, it enters the queue right behind them. If not, it enters the queue at the tail and becomes the new last element (bad luck). Dequeuing is done like in normal queues: elements are processed from head to tail in the order they appear in the team queue.

Your task is to write a program that simulates such a team queue.

Input 

The input file will contain one or more test cases. Each test case begins with the number of teams t (). Then t team descriptions follow, each one consisting of the number of elements belonging to the team and the elements themselves. Elements are integers in the range 0 - 999999. A team may consist of up to 1000 elements.

Finally, a list of commands follows. There are three different kinds of commands:

• ENQUEUE x - enter element x into the team queue
• DEQUEUE - process the first element and remove it from the queue
• STOP - end of test case

The input will be terminated by a value of 0 for t.

Warning: A test case may contain up to 200000 (two hundred thousand) commands, so the implementation of the team queue should be efficient: both enqueing and dequeuing of an element should only take constant time.

Output 

For each test case, first print a line saying ``Scenario #k", where k is the number of the test case. Then, for each DEQUEUE command, print the element which is dequeued on a single line. Print a blank line after each test case, even after the last one.

Sample Input 

23 101 102 1033 201 202 203ENQUEUE 101ENQUEUE 201ENQUEUE 102ENQUEUE 202ENQUEUE 103ENQUEUE 203DEQUEUEDEQUEUEDEQUEUEDEQUEUEDEQUEUEDEQUEUESTOP25 259001 259002 259003 259004 2590056 260001 260002 260003 260004 260005 260006ENQUEUE 259001ENQUEUE 260001ENQUEUE 259002ENQUEUE 259003ENQUEUE 259004ENQUEUE 259005DEQUEUEDEQUEUEENQUEUE 260002ENQUEUE 260003DEQUEUEDEQUEUEDEQUEUEDEQUEUESTOP0

Sample Output 

Scenario #1101102103201202203Scenario #2259001259002259003259004259005260001

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Miguel A. Revilla 
1999-01-11//给定小队列的数目，再依次给定各个小队列的成员数，然后命令操作进入进出大队列，进入队列时若已经有本小队列的队友，就跟在本小队列的队友后面，若没有小队列的队友在大队列里面，就排在整个大队列的最后，而出列是从大队列的最前面开始出列！

#include<stdio.h>#include<string.h>int front[1002],rear[1002],a[1000002],q[5001][5002],vis[1002];main(){int i,j,num,u,count=1,d,temp,flag1,flag2,t,tt;char str[100];//freopen("d:\\pp.txt","r",stdin);while(scanf("%d",&t)&&t){printf("Scenario #%d\n",count++);memset(a,0,sizeof(a));memset(q,0,sizeof(q));memset(vis,-1,sizeof(vis));memset(rear,0,sizeof(rear));memset(front,0,sizeof(front));for(i=0;i<t;i++){scanf("%d",&num);for(j=0;j<num;j++){scanf("%d",&u);a[u]=i;//标志所在的小队列}}flag1=flag2=tt=0;while(scanf("%s",str)){if(str[0]=='E'){scanf("%d",&d);temp=a[d];if(vis[temp]!=-1)//有队友在大队列里面{flag2=vis[temp];q[flag2][rear[flag2]++]=d;}else //没有队友在大队列里面{vis[temp]=flag1;q[flag1][rear[flag1]++]=d;flag1++;}}else if(str[0]=='D'){if(front[tt]==rear[tt])tt++;printf("%d\n",q[tt][front[tt]++]);if(front[tt]==rear[tt])  vis[a[q[tt][front[tt]-1]]]=-1;//某个小队里的全部成员从大队列里出列}else if(str[0]=='S')break;}printf("\n");}return 0;}