UVA - 540 Team Queue

书上的代码交上去Runtime Error，故按照自己的思路重写了

#include <bits/stdc++.h>
using namespace std;


int main()
{
#ifndef ONLINE_JUDGE
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
#endif

    int t, cnt = 0;
    while(scanf("%d", &t), t!=0)
    {
        map<int, int> team;
        queue<int> qu;
        map<int, queue<int>> x;

        for(int i = 0; i < t; i++)
        {
            int m;
            scanf("%d", &m);
            for(int j = 0; j < m; j++)
            {
                int stu;
                scanf("%d", &stu);
                team.insert(make_pair(stu, i));
            }
        }

        printf("Scenario #%d\n", ++cnt);
        char cmd[16];
        while(scanf("%s", cmd), cmd[0]!='S')
        {
            if(cmd[0]=='E')
            {
                int stu;
                scanf("%d", &stu);
                if(x[team[stu]].empty())
                {
                    qu.push(team[stu]);
                    x[team[stu]].push(stu);
                }
                else
                    x[team[stu]].push(stu);
            }
            else if(cmd[0]=='D')
            {
                int front_team;
                front_team = qu.front();
                printf("%d\n", x[front_team].front());
                x[front_team].pop();
                if(x[front_team].empty())
                    qu.pop();
            }
        }
        printf("\n");
    }
    return 0;
}