Compilare: user.cpp: In member function ‘char InputReader::nextpos()’: user.cpp:38:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, Size, 1, fin); ^ user.cpp: In function ‘int main()’: user.cpp:167:50: warning: ‘cy’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << ans << "\n" << cx - dx + 1 << " " << cy << " " << cx + 1 << " " << cy + dy << "\n"; ^ user.cpp:167:31: warning: ‘cx’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << ans << "\n" << cx - dx + 1 << " " << cy << " " << cx + 1 << " " << cy + dy << "\n"; ^