Borderou de evaluare (job #688904)

Eroare de compilare: main.cpp: In function 'int main()': main.cpp:16:18: error: no match for 'operator<<' (operand types are 'std::ifstream' {aka 'std::basic_ifstream<char>'} and 'double') 16 | if(a==b) fout<<n-(a-1)*(a-1)<<endl; | ~~~~^~~~~~~~~~~~~~~ | | | | | double | std::ifstream {aka std::basic_ifstream<char>} In file included from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/regex:63, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/i686-pc-linux-gnu/bits/stdc++.h:110, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/regex.h:1671:5: note: candidate: 'template<class _Ch_type, class _Ch_traits, class _Bi_iter> std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::sub_match<_Bi_iter>&)' 1671 | operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os, | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/regex.h:1671:5: note: template argument deduction/substitution failed: main.cpp:16:32: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 16 | if(a==b) fout<<n-(a-1)*(a-1)<<endl; | ^ In file included from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/string:55, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/locale_classes.h:40, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/ios_base.h:41, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/ios:42, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/istream:38, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/sstream:38, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/complex:45, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/ccomplex:39, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/i686-pc-linux-gnu/bits/stdc++.h:54, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/basic_string.h:6531:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)' 6531 | operator<<(basic_ostream<_CharT, _Traits>& __os, | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/basic_string.h:6531:5: note: template argument deduction/substitution failed: main.cpp:16:32: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 16 | if(a==b) fout<<n-(a-1)*(a-1)<<endl; | ^ In file included from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/bits/ios_base.h:46, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/ios:42, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/istream:38, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/sstream:38, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/complex:45, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/ccomplex:39, from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/i686-pc-linux-gnu/bits/stdc++.h:54, from main.cpp:1: /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/system_error:279:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)' 279 | operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e) | ^~~~~~~~ /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/system_error:279:5: note: template argument deduction/substitution failed: main.cpp:16:32: note: 'std::ifstream' {aka 'std::basic_ifstream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>' 16 | if(a==b) fout<<n-(a-1)*(a-1)<<endl; | ^ In file included from /usr/lib/gcc/i686-pc-linux-gnu/11/include/g++-v11/istream:39,