Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:70:27: error: no match for ‘operator*’ (operand types are ‘double’ and ‘std::valarray<long double>’) sys[k] -= val * sys[i]; ^ user.cpp:70:27: note: candidates are: In file included from /usr/include/c++/4.8/ccomplex:38:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/4.8/complex:384:5: note: template<class _Tp> std::complex<_Tp> std::operator*(const std::complex<_Tp>&, const std::complex<_Tp>&) operator*(const complex<_Tp>& __x, const complex<_Tp>& __y) ^ /usr/include/c++/4.8/complex:384:5: note: template argument deduction/substitution failed: user.cpp:70:34: note: mismatched types ‘const std::complex<_Tp>’ and ‘double’ sys[k] -= val * sys[i]; ^ In file included from /usr/include/c++/4.8/ccomplex:38:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/4.8/complex:393:5: note: template<class _Tp> std::complex<_Tp> std::operator*(const std::complex<_Tp>&, const _Tp&) operator*(const complex<_Tp>& __x, const _Tp& __y) ^ /usr/include/c++/4.8/complex:393:5: note: template argument deduction/substitution failed: user.cpp:70:34: note: mismatched types ‘const std::complex<_Tp>’ and ‘double’ sys[k] -= val * sys[i]; ^ In file included from /usr/include/c++/4.8/ccomplex:38:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:52, from user.cpp:1: /usr/include/c++/4.8/complex:402:5: note: template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const std::complex<_Tp>&) operator*(const _Tp& __x, const complex<_Tp>& __y) ^ /usr/include/c++/4.8/complex:402:5: note: template argument deduction/substitution failed: user.cpp:70:34: note: ‘std::valarray<long double>’ is not derived from ‘const std::complex<_Tp>’ sys[k] -= val * sys[i]; ^ In file included from /usr/include/c++/4.8/valarray:587:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94, from user.cpp:1: /usr/include/c++/4.8/bits/valarray_after.h:404:5: note: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&) _DEFINE_EXPR_BINARY_OPERATOR(*, __multiplies) ^ /usr/include/c++/4.8/bits/valarray_after.h:404:5: note: template argument deduction/substitution failed: user.cpp:70:34: note: mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘double’ sys[k] -= val * sys[i]; ^ In file included from /usr/include/c++/4.8/valarray:587:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:94, from user.cpp:1: /usr/include/c++/4.8/bits/valarray_after.h:404:5: note: template<class _Dom> std::_Expr<std::_BinClos<std::__multiplies, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&) _DEFINE_EXPR_BINARY_OPERATOR(*, __multiplies)