Eroare de compilare: In file included from /usr/include/c++/6/bits/char_traits.h:39:0, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/stl_algobase.h: In instantiation of 'constexpr const _Tp& std::max(const _Tp&, const _Tp&) [with _Tp = elem]': main.cpp:83:88: required from here /usr/include/c++/6/bits/stl_algobase.h:224:15: error: no match for 'operator<' (operand types are 'const elem' and 'const elem') if (__a < __b) ~~~~^~~~~ In file included from /usr/include/c++/6/forward_list:38:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:104, from main.cpp:1: /usr/include/c++/6/bits/forward_list.h:1376:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator<(const std::forward_list<_Tp, _Alloc>&, const std::forward_list<_Tp, _Alloc>&) operator<(const forward_list<_Tp, _Alloc>& __lx, ^~~~~~~~ /usr/include/c++/6/bits/forward_list.h:1376:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/6/bits/char_traits.h:39:0, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/stl_algobase.h:224:15: note: 'const elem' is not derived from 'const std::forward_list<_Tp, _Alloc>' if (__a < __b) ~~~~^~~~~ In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0, from main.cpp:1: /usr/include/c++/6/valarray:1181:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__less, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__less, _Tp>::result_type> std::operator<(const _Tp&, const std::valarray<_Tp>&) _DEFINE_BINARY_OPERATOR(<, __less) ^ /usr/include/c++/6/valarray:1181:1: note: template argument deduction/substitution failed: In file included from /usr/include/c++/6/bits/char_traits.h:39:0, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/sstream:38, from /usr/include/c++/6/complex:45, from /usr/include/c++/6/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52, from main.cpp:1: /usr/include/c++/6/bits/stl_algobase.h:224:15: note: 'const elem' is not derived from 'const std::valarray<_Tp>' if (__a < __b) ~~~~^~~~~ In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0, from main.cpp:1: Non zero exit status: 1