Compilare: user.cpp: In function ‘int DFS(int)’: user.cpp:73:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:20:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:47:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^