/in/foo.cc: In function 'bool cmp(qujian, qujian)':
/in/foo.cc:15:8: warning: statement has no effect [-Wunused-value]
   q1.y > q2.y;
   ~~~~~^~~~~~
/in/foo.cc:17:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^