Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:19:6: error: no match for ‘operator<<’ (operand types are ‘std::ifstream {aka std::basic_ifstream<char>}’ and ‘long long int’) cout<<rs; ^ user.cpp:19:6: note: candidate: operator<<(int, long long int) <built-in> user.cpp:19:6: note: no known conversion for argument 1 from ‘std::ifstream {aka std::basic_ifstream<char>}’ to ‘int’ In file included from /usr/include/c++/5/regex:61:0, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:108, from user.cpp:1: /usr/include/c++/5/bits/regex.h:1480:5: 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>&) operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os, ^ /usr/include/c++/5/bits/regex.h:1480:5: note: template argument deduction/substitution failed: user.cpp:19:8: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’ cout<<rs; ^ In file included from /usr/include/c++/5/future:40:0, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:103, from user.cpp:1: /usr/include/c++/5/thread:243:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::thread::id) operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id) ^ /usr/include/c++/5/thread:243:5: note: template argument deduction/substitution failed: user.cpp:19:8: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’ cout<<rs; ^ In file included from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:94:0, from user.cpp:1: /usr/include/c++/5/valarray:1175:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__shift_left, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const _Tp&, const std::valarray<_Tp>&) _DEFINE_BINARY_OPERATOR(<<, __shift_left) ^ /usr/include/c++/5/valarray:1175:1: note: template argument deduction/substitution failed: user.cpp:19:8: note: mismatched types ‘const std::valarray<_Tp>’ and ‘long long int’ cout<<rs; ^ In file included from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:94:0, from user.cpp:1: /usr/include/c++/5/valarray:1175:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__shift_left, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const std::valarray<_Tp>&, const _Tp&) _DEFINE_BINARY_OPERATOR(<<, __shift_left) ^ /usr/include/c++/5/valarray:1175:1: note: template argument deduction/substitution failed: user.cpp:19:8: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::valarray<_Tp>’ cout<<rs; ^ In file included from /usr/include/x86_64-linux-gnu/c++/5/32/bits/stdc++.h:94:0, from user.cpp:1: /usr/include/c++/5/valarray:1175:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__shift_left, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const std::valarray<_Tp>&, const std::valarray<_Tp>&) _DEFINE_BINARY_OPERATOR(<<, __shift_left) ^ /usr/include/c++/5/valarray:1175:1: note: template argument deduction/substitution failed: