/in/foo.cc: In function 'int main()':
/in/foo.cc:18:58: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[20]' [-Wformat=]
   scanf("%d %s\n", &(persons[i].face), &(persons[i].name));
                                                          ^
/in/foo.cc:20:6: warning: unused variable 'direction' [-Wunused-variable]
  int direction = 0; //0-counter-clockwise(+1), 1--clockwise(-1)
      ^~~~~~~~~