hdu 1873 看病要排隊（優先隊列）

#include<stdio.h>
#include<string.h>
#include<algorithm>
#include<queue>
using namespace std;
int t;
struct node
{
    int rank,num;
    friend bool operator < (node a,node b)
    {
        if(a.rank == b.rank) return a.num > b.num;
        return a.rank < b.rank;
    }
};
void bfs()
{
    char a[5];
    int i = 1,n,m;
    priority_queue <node> q[4];
    node s;
    while(t--)
    {
        scanf("%s",a);
        if(strcmp(a,"IN") == 0)
        {
            scanf("%d%d",&n,&m);
            s.rank = m;
            s.num = i++;
            q[n].push(s);
        }
        else
        {
            scanf("%d",&n);
            if(q[n].empty()) printf("EMPTY\n");
            else
            {
                s = q[n].top();
                q[n].pop();
                printf("%d\n",s.num);
            }
        }
    }
}
int main()
{
    while(~scanf("%d",&t))
    {
        bfs();
    }
    return 0;
}