/in/foo.cc: In function 'void wrong_work()':
/in/foo.cc:47:45: warning: array subscript has type 'char' [-Wchar-subscripts]
  for (rg int i = 1;i <= la;++i) ++buc_a[a[i]];
                                             ^
/in/foo.cc:48:45: warning: array subscript has type 'char' [-Wchar-subscripts]
  for (rg int i = 1;i <= lb;++i) ++buc_b[b[i]];
                                             ^
/in/foo.cc:52:17: warning: array subscript has type 'char' [-Wchar-subscripts]
   --buc_b[b[del]];
                 ^
/in/foo.cc:53:19: warning: array subscript has type 'char' [-Wchar-subscripts]
   if (buc_a[b[del]] && buc_b[b[del]] < buc_a[b[del]])
                   ^
/in/foo.cc:53:36: warning: array subscript has type 'char' [-Wchar-subscripts]
   if (buc_a[b[del]] && buc_b[b[del]] < buc_a[b[del]])
                                    ^
/in/foo.cc:53:52: warning: array subscript has type 'char' [-Wchar-subscripts]
   if (buc_a[b[del]] && buc_b[b[del]] < buc_a[b[del]])
                                                    ^