Compilare: user.cpp: In function ‘void insert(char*)’: user.cpp:61:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!Q->f[c]) ^ user.cpp:62:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] Q->f[c] = new node; ^ user.cpp:63:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] Q = Q->f[c]; ^ user.cpp: In function ‘int main()’: user.cpp:95:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!Q->f[c]) ^ user.cpp:97:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] Q = Q->f[c]; ^ user.cpp:74:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFile.c_str(), "r", stdin); ^ user.cpp:75:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFile.c_str(), "w", stdout); ^ user.cpp:78:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:79:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", W + 1); ^ user.cpp:84:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", word + 1); ^