/in/foo.cc: In function 'int genyuan(int)':
/in/foo.cc:20:6: warning: unused variable 'y' [-Wunused-variable]
  int y=genyuan(zhan[n].chuan);
      ^
/in/foo.cc: In function 'int yi(int, int)':
/in/foo.cc:38:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^