Compilare: user.cpp: In function ‘int main()’: user.cpp:103:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++) ^ user.cpp: In member function ‘void inputReader::advance()’: user.cpp:22:48: 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, inputFile ); ^ user.cpp: In constructor ‘inputReader::inputReader(const char*)’: user.cpp:34:44: 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, inputFile ); ^