Compilare: main.cpp: In function 'int main()': main.cpp:87:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (H.size () > maxGrad) { ~~~~~~~~~~^~~~~~~~~ main.cpp: In member function 'void inputReader::advance()': main.cpp:28:48: 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:40:44: 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 ); ^