Compilare: main.cpp: In function 'int calc(int)': main.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L[nod].size (); ++ i) { ~~^~~~~~~~~~~~~~~~ main.cpp: In member function 'void inputReader::advance()': main.cpp:18:48: 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 ); ^ main.cpp: In constructor 'inputReader::inputReader(const char*)': main.cpp:30:44: 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 ); ^