View Compilation Error

0_0_26070705_28761.cpp:11:33: error: 'mai' does not name a type
 priority_queue<sell>Sell,REsell;mai///Sell 表示已经买了的（假买）  REsell表示卖了的（假卖）
                                 ^
0_0_26070705_28761.cpp: In function 'int main()':
0_0_26070705_28761.cpp:29:9: error: 'ans' was not declared in this scope
         ans=num=0;
         ^
0_0_26070705_28761.cpp:29:13: error: 'num' was not declared in this scope
         ans=num=0;
             ^