Eroare de compilare: main.cpp: In function 'int main()': main.cpp:30:13: error: reference to 'ref' is ambiguous 30 | ref = i; | ^~~ In file included from /usr/include/c++/12.2.1/string:51, from /usr/include/c++/12.2.1/bits/locale_classes.h:40, from /usr/include/c++/12.2.1/bits/ios_base.h:41, from /usr/include/c++/12.2.1/ios:42, from /usr/include/c++/12.2.1/istream:38, from /usr/include/c++/12.2.1/sstream:38, from /usr/include/c++/12.2.1/complex:45, from /usr/include/c++/12.2.1/ccomplex:39, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:54, from main.cpp:1: /usr/include/c++/12.2.1/bits/refwrap.h:393:5: note: candidates are: 'template<class _Tp> constexpr std::reference_wrapper<_Tp> std::ref(reference_wrapper<_Tp>)' 393 | ref(reference_wrapper<_Tp> __t) noexcept | ^~~ /usr/include/c++/12.2.1/bits/refwrap.h:384:10: note: 'template<class _Tp> void std::ref(const _Tp&&)' 384 | void ref(const _Tp&&) = delete; | ^~~ /usr/include/c++/12.2.1/bits/refwrap.h:373:5: note: 'template<class _Tp> constexpr std::reference_wrapper<_Tp> std::ref(_Tp&)' 373 | ref(_Tp& __t) noexcept | ^~~ main.cpp:11:26: note: 'int ref' 11 | int n, stk[150005], top, ref; | ^~~ main.cpp:39:18: error: reference to 'ref' is ambiguous 39 | swap(a[1], a[ref]); | ^~~ /usr/include/c++/12.2.1/bits/refwrap.h:393:5: note: candidates are: 'template<class _Tp> constexpr std::reference_wrapper<_Tp> std::ref(reference_wrapper<_Tp>)' 393 | ref(reference_wrapper<_Tp> __t) noexcept | ^~~ /usr/include/c++/12.2.1/bits/refwrap.h:384:10: note: 'template<class _Tp> void std::ref(const _Tp&&)' 384 | void ref(const _Tp&&) = delete; | ^~~ /usr/include/c++/12.2.1/bits/refwrap.h:373:5: note: 'template<class _Tp> constexpr std::reference_wrapper<_Tp> std::ref(_Tp&)' 373 | ref(_Tp& __t) noexcept | ^~~ main.cpp:11:26: note: 'int ref' 11 | int n, stk[150005], top, ref; | ^~~ Non zero exit status: 1