Compilare: user.cpp: In function ‘void pre()’: user.cpp:36:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] cti[c] = c - 'a'; ^ user.cpp:38:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] cti[c] = c - 'A'; ^ user.cpp: In member function ‘void trie::insert(char*, int)’: user.cpp:63:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] int nc = cti[*buf]; ^ user.cpp: In member function ‘int trie::query(char*)’: user.cpp:71:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] int nc = cti[*buf]; ^ user.cpp: In function ‘int main()’: user.cpp:93:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &_); ^ user.cpp:96:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:99:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", words[i]); ^ user.cpp:110:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %c%s", &tip, auxbuf); ^ user.cpp:120:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &amount); ^