UVa 540 Team Queue：STL list&queue模拟插队

UVa 540 Team Queue：STL list&queue模拟插队2014-07-31 csdn博客 synapse7

540 - Team Queue

Time limit: 3.000 seconds

http://uva.onlinejudge.org/index.php？option=com_onlinejudge&Itemid=8&category=103&page=show_problem&problem=481

Queues and Priority Queues are data structures which are known to most computer scientists. TheTeam 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 itsteammates （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 teamst （

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", wherek is the number of the test case. Then, for eachDEQUEUE 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