Compilare: main.cpp: In member function 'void SubProblem::update(int, int)': main.cpp:98:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<stack.size(); i++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:143:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=x/rad+1; j<sqrtsegm.size(); j++) { ~^~~~~~~~~~~~~~~~ main.cpp: In member function 'void InputReader::advance()': main.cpp:37:51: 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); ^ main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:15:47: 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); ^