Team Queue(STL练习题)

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1387

Team Queue

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 1518    Accepted Submission(s): 511

Problem Description

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 will contain one or more test cases. Each test case begins with the number of teams t (1<=t<=1000). 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.

 

 

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

2 3 101 102 103 3 201 202 203 ENQUEUE 101 ENQUEUE 201 ENQUEUE 102 ENQUEUE 202 ENQUEUE 103 ENQUEUE 203 DEQUEUE DEQUEUE DEQUEUE DEQUEUE DEQUEUE DEQUEUE STOP 2 5 259001 259002 259003 259004 259005 6 260001 260002 260003 260004 260005 260006 ENQUEUE 259001 ENQUEUE 260001 ENQUEUE 259002 ENQUEUE 259003 ENQUEUE 259004 ENQUEUE 259005 DEQUEUE DEQUEUE ENQUEUE 260002 ENQUEUE 260003 DEQUEUE DEQUEUE DEQUEUE DEQUEUE STOP 0

 

 

Sample Output

Scenario #1 101 102 103 201 202 203 Scenario #2 259001 259002 259003 259004 259005 260001

 

 

Source

University of Ulm Local Contest 1998

题意: 模拟题,模拟排队

//deque 双向队列
#include<cstdio>
#include<algorithm>
#include<queue>
#include<vector>
#include<map>
#include<cstring>
using namespace std;
#define N 1010
deque<int> qu[N];//保存大的队列中的出现的每个小团队
map<int, int> mp;//保存每个人属于哪一个团队
vector <int > vv;//保存大的队列中的每个小团队出现的顺序
void init()
{
    mp.clear();
    for(int i =0 ;i < N ; i++)
    {
        qu[i].clear();
    }
    vv.clear();
}
int main()
{
    int tm;
    int cnt = 0;
    while(~scanf("%d",&tm)&&tm!=0)
    {
        cnt++;
        int rs;
        init();
        for(int i = 0 ; i < tm ; i++)
        {
            scanf("%d",&rs);
            for(int j= 0 ;  j < rs ; j++)
            {
                int t;
                scanf("%d",&t);
                mp[t] = i;
            }
        }
        char ml[10];
        printf("Scenario #%d\n",cnt);
        vector <int> ::iterator it ;
        while(~scanf("%s",ml))
        {
            if(ml[0]=='S') break;
            else if(ml[0]=='E') 
            {
                int tt;
                scanf("%d",&tt);
                int fl = mp[tt];
                if(!qu[fl].empty())
                {
                    qu[fl].push_back(tt);
                }
                else
                {
                    it = find(vv.begin(),vv.end(),fl);
                    if(it != vv.end()) vv.erase(it);
                    vv.push_back(fl);
                    qu[fl].push_back(tt);
                }
            }
            else if(ml[0]=='D')
            {
                int flag = 0;
                while(qu[vv[flag]].empty())
                {
                    flag+=1;
                }
                int o= qu[vv[flag]].front() ;
                printf("%d\n",o);
                qu[vv[flag]].pop_front();
            }
        }
        puts("");
    }
    return 0;
}

下面给出一个queue 的写法,更新一个知识点,queue的pop函数是用来去除最前面的元素的所以可以直接用pop

#include<cstdio>
#include<queue>
#include<map>
using namespace std;
const int maxn = 1010;
int main()
{
    int t , kase = 0 ;
    while(~scanf("%d",&t),t)
    {
        printf("Scenario #%d\n",++kase);
        //记录所有人的团队编号
        map<int , int> team;
        for(int  i = 0 ;i < t ; i++)
        {
            int n , x;
            scanf("%d",&n);
            while(n--){
                scanf("%d",&x); team[x] = i;
            }
        }
        //模拟
        queue<int> q, q2[maxn];//q是团队的队列,q2是团队i成员的队列
        for(;;)
        {
            int x ;
            char cmd[10];
            scanf("%s",cmd);
            if(cmd[0]=='S') break;
            else if(cmd[0] =='D')
            {
                int t = q.front();
                printf("%d\n",q2[t].front());q2[t].pop();
                if(q2[t].empty()) q.pop();//团队t全部出队
            }
            else if(cmd[0] == 'E')
            {
                scanf("%d",&x);
                int t = team[x];
                if(q2[t].empty()) q.push(t);
                q2[t].push(x);
            }
        }
        printf("\n");
    }
    return 0;
}