Compilare: user.cpp: In function ‘void insert(T*, char*, int)’: user.cpp:31:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( n -> chl[ch(*str)] == NULL ) { ^ user.cpp:32:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] n -> chl[ch(*str)] = new T; } ^ user.cpp:33:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] insert( n -> chl[ch(*str)], str + 1, pos ); ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:72:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] while( aux != r && aux -> chl[ch(str[i])] == NULL ) { ^ user.cpp:74:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if( aux -> chl[ch(str[i])] != NULL ) { ^ user.cpp:75:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] aux = aux -> chl[ch(str[i])]; } ^