/in/foo.cc: In function 'void insert(const char*)':
/in/foo.cc:21:32: warning: array subscript has type 'char' [-Wchar-subscripts]
if (ch[p][cvt_ci[str[i]]] == 0)
^
/in/foo.cc:22:32: warning: array subscript has type 'char' [-Wchar-subscripts]
ch[p][cvt_ci[str[i]]] = ++ptot;
^
/in/foo.cc:23:32: warning: array subscript has type 'char' [-Wchar-subscripts]
p = ch[p][cvt_ci[str[i]]];
^
/in/foo.cc: In function 'int search(const char*)':
/in/foo.cc:52:37: warning: array subscript has type 'char' [-Wchar-subscripts]
int id = cvt_ci[str[dep + 1]];
^