Eroare de compilare: In file included from /usr/include/c++/10/bits/stl_algobase.h:71, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/sstream:38, from /usr/include/c++/10/complex:45, from /usr/include/c++/10/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54, from main.cpp:1: /usr/include/c++/10/bits/predefined_ops.h: In instantiation of 'constexpr bool __gnu_cxx::__ops::_Iter_less_iter::operator()(_Iterator1, _Iterator2) const [with _Iterator1 = vrajeala1*; _Iterator2 = vrajeala1*]': /usr/include/c++/10/bits/stl_algo.h:82:17: required from 'void std::__move_median_to_first(_Iterator, _Iterator, _Iterator, _Iterator, _Compare) [with _Iterator = vrajeala1*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' /usr/include/c++/10/bits/stl_algo.h:1924:34: required from '_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = vrajeala1*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' /usr/include/c++/10/bits/stl_algo.h:1958:38: required from 'void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = vrajeala1*; _Size = long int; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' /usr/include/c++/10/bits/stl_algo.h:1974:25: required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = vrajeala1*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' /usr/include/c++/10/bits/stl_algo.h:4861:18: required from 'void std::sort(_RAIter, _RAIter) [with _RAIter = vrajeala1*]' main.cpp:122:28: required from here /usr/include/c++/10/bits/predefined_ops.h:43:23: error: no match for 'operator<' (operand types are 'vrajeala1' and 'vrajeala1') 43 | { return *__it1 < *__it2; } | ~~~~~~~^~~~~~~~ main.cpp:60:10: note: candidate: 'bool vrajeala1::operator<(vrajeala) const' 60 | bool operator < (const vrajeala A) const | ^~~~~~~~ main.cpp:60:37: note: no known conversion for argument 1 from 'vrajeala1' to 'vrajeala' 60 | bool operator < (const vrajeala A) const | ~~~~~~~~~~~~~~~^ In file included from /usr/include/c++/10/bits/stl_algobase.h:67, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/sstream:38, from /usr/include/c++/10/complex:45, from /usr/include/c++/10/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54, from main.cpp:1: /usr/include/c++/10/bits/stl_iterator.h:1121:5: note: candidate: 'template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator<(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)' 1121 | operator<(const __normal_iterator<_IteratorL, _Container>& __lhs, | ^~~~~~~~ /usr/include/c++/10/bits/stl_iterator.h:1121:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/10/bits/stl_algobase.h:71, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/sstream:38, from /usr/include/c++/10/complex:45, from /usr/include/c++/10/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54, from main.cpp:1: /usr/include/c++/10/bits/predefined_ops.h:43:23: note: 'vrajeala1' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>' 43 | { return *__it1 < *__it2; } | ~~~~~~~^~~~~~~~ Non zero exit status: 1