/in/foo.cc: In function 'int main()':
/in/foo.cc:57:8: warning: unused variable 'x' [-Wunused-variable]
    int x=mid();
        ^
/in/foo.cc: In function 'int mid()':
/in/foo.cc:42:9: warning: 'ggg' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ggg;
         ^~~