Compilare: user.cpp: In function ‘void addWord(const char*)’: user.cpp:38:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cur_node->f[cur_char] == 0) { ^ user.cpp:39:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] cur_node->f[cur_char] = new trie_node(); ^ user.cpp:41:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] cur_node = cur_node->f[cur_char]; ^ user.cpp: In function ‘int countMatchingPrefixes(const char*, int)’: user.cpp:55:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cur_node->f[cur_char] == 0) { ^ user.cpp:58:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] cur_node = cur_node->f[cur_char]; ^ user.cpp:63:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cur_node->f[cur_char] == 0) { ^ user.cpp:66:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] cur_node = cur_node->f[cur_char]; ^ user.cpp:50:15: warning: unused variable ‘firstPos’ [-Wunused-variable] const int firstPos = k * x; ^ user.cpp:51:15: warning: unused variable ‘secondPos’ [-Wunused-variable] const int secondPos = min(k * (x + 1), k * p); ^