/in/foo.cc: In function 'int main()':
/in/foo.cc:22:13: error: 'fin' was not declared in this scope
     fscanf (fin, "%d", &n);
             ^~~
/in/foo.cc:22:13: note: suggested alternative: 'main'
     fscanf (fin, "%d", &n);
             ^~~
             main
/in/foo.cc:31:14: error: 'fout' was not declared in this scope
     fprintf (fout, "%d\n", medians[n/2]);
              ^~~~
/in/foo.cc:31:14: note: suggested alternative: 'fputs'
     fprintf (fout, "%d\n", medians[n/2]);
              ^~~~
              fputs