Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:41:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0 ; i < Graph[x].size() && !negative_cycle ; ++i ) ^ user.cpp:45:17: error: reference to ‘prev’ is ambiguous prev[Graph[x][i]] = x; ^ user.cpp:13:17: note: candidates are: int prev [50001] int best[MAXN], prev[MAXN], better[MAXN]; ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_algobase.h:66:0, from /usr/local/include/c++/4.8.0/vector:60, from user.cpp:2: /usr/local/include/c++/4.8.0/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 ^