Eroare de compilare: user.cpp: In function ‘void back(int, int)’: user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<g[nod].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:42:17: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (i>>(n-1)&1==1) next=curent*2-(1<<n)+1; else ^ user.cpp:42:24: error: reference to ‘next’ is ambiguous if (i>>(n-1)&1==1) next=curent*2-(1<<n)+1; else ^ user.cpp:20:26: note: candidates are: int next int n,i,sol[nmax],curent,next,x,y,fr[nmax],maxx; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:184:5: note: template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type) next(_ForwardIterator __x, typename ^ user.cpp:43:9: error: reference to ‘next’ is ambiguous next=curent*2+1; ^ user.cpp:20:26: note: candidates are: int next int n,i,sol[nmax],curent,next,x,y,fr[nmax],maxx; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:184:5: note: template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type) next(_ForwardIterator __x, typename ^ user.cpp:44:20: error: reference to ‘next’ is ambiguous g[i].push_back(next); ^ user.cpp:20:26: note: candidates are: int next int n,i,sol[nmax],curent,next,x,y,fr[nmax],maxx; ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: