Compilare: user.cpp: In member function ‘void Trie::_remove(Trie::node*, std::string&, int)’: user.cpp:32:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < word.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:89:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( IA_PROB".in", "r", stdin ); ^ user.cpp:90:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( IA_PROB".out", "w", stdout ); ^ user.cpp:95:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( line, 32, stdin ); ^ user.cpp:107:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( line, 32, stdin ); ^