在线求中位数（优先队列实现） POJ3784

 1 #include <iostream>
 2 #include <cstring>
 3 #include <cstdio>
 4 #include <queue>
 5 
 6 using namespace std;
 7 
 8 priority_queue<int,vector<int>,greater<int> >pq2;
 9 priority_queue<int> pq1;
10 
11 int main()
12 {
13     int T;
14     cin>>T;
15     int time;
16     int m;
17     while(T--)
18     {
19         while(!pq1.empty())
20             pq1.pop();
21         while(!pq2.empty())
22             pq2.pop();
23         int x;
24         cin>>time>>m;
25         cout<<time<<" "<<(m+1)/2<<endl;
26         cin>>x;
27         int mid=x;
28         cout<<mid;
29         for(int i=2;i<=m;i++)
30         {
31             cin>>x;
32             if(x>mid)
33                 pq2.push(x);
34             else
35                 pq1.push(x);
36             if(i%2==1)
37             {
38                 if(pq1.size()==(pq2.size()+2))
39                 {
40                     pq2.push(mid);
41                     mid=pq1.top();
42                     pq1.pop();
43                 }
44                 else if((pq1.size()+2)==pq2.size())
45                 {
46                     pq1.push(mid);
47                     mid=pq2.top();
48                     pq2.pop();
49                 }
50                 if(i%20==1)
51                     cout<<mid;
52                 else
53                     cout<<" "<<mid;
54             }
55             if(i%20==19)
56                 cout<<endl;
57         }
58         cout<<endl;
59     }
60     return 0;
61 }
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