UVA 540 Team Queue

思路：使用优先队列，按队伍出现的时刻和自身出现的时刻定义优先级，同时记录此时刻队列里是否有自己队伍的人，一开始没注意，wa了两发。

#include<map>
#include<queue>
#include<cstdio>
#include<string>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
const int MAXN = 1010;
map<int, int>mp;
int teamPos[MAXN],existElem[MAXN], T, n;
struct Elem{
    int idx, pos, self;
    Elem(int idx, int pos, int self){
        this->pos = pos;
        this->idx = idx;
        this->self = self;
    }
    bool operator < (const Elem &A) const {
        if(idx == A.idx) return pos > A.pos;
        return idx > A.idx;
    }
};
int main(){
    string str;
    int elemNum, CASE(0);
    freopen("in.cpp", "r", stdin);
    while(~scanf("%d", &T) && T){
        mp.clear();
        priority_queue<Elem>Q;
        while(!Q.empty()) Q.pop();
        for(int i = 1;i <= T;i ++){
            scanf("%d", &n);
            for(int j = 0;j < n;j ++){
                scanf("%d", &elemNum);
                mp.insert(pair<int, int>(elemNum, i));
            }
        }
        int num(0), cnt(0);
        memset(teamPos, 0, sizeof teamPos);
        memset(existElem, 0, sizeof existElem);
        printf("Scenario #%d\n", ++CASE);
        while(cin >> str && str[0] != 'S'){
            if(str[0] == 'D'){
                int tmp = Q.top().self;
                printf("%d\n",tmp);
                map<int, int>::iterator it = mp.find(tmp);
                existElem[it->second] --;
                Q.pop();
                continue;
            }
            scanf("%d", &n);
            map<int, int>::iterator it = mp.find(n);
            int idx = it->second;
            if(teamPos[idx] && existElem[idx]) Q.push(Elem(teamPos[idx], cnt++, n));
            else{
                Q.push(Elem(++num, cnt++, n));
                teamPos[idx] = num;
            }
            existElem[idx]++;
        }
        puts("");
    }
    return 0;
}