Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:24:62: error: reference to ‘prev’ is ambiguous if(date[i-1].y*date[i].x!=date[i-1].x*date[i].y) h++,prev=i; ^ user.cpp:10:7: note: candidates are: int prev int n,prev,m,nr; ^ In file included from /usr/include/c++/5/bits/stl_algobase.h:66:0, from /usr/include/c++/5/bits/char_traits.h:39, from /usr/include/c++/5/ios:40, from /usr/include/c++/5/istream:38, from /usr/include/c++/5/fstream:38, from user.cpp:1: /usr/include/c++/5/bits/stl_iterator_base_funcs.h:193:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^