/in/foo.cc: In function 'void ins(char*, int)':
/in/foo.cc:22:16: warning: unused variable 'x' [-Wunused-variable]
  node *p=root,*x;
                ^
/in/foo.cc: In function 'void query(char*)':
/in/foo.cc:55:16: warning: unused variable 'x' [-Wunused-variable]
  node *p=root,*x;
                ^