Eroare de compilare: main.cpp: In function 'int cauta(int, int)': main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < v[x].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int unionstr(int, int)': main.cpp:64:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void afisare(int, int)': main.cpp:68:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < G[x].size() ; i ++) ~~^~~~~~~~~~~~~ main.cpp:71:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = G[x][i].poz ; j < v[y].length() ; j ++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:97:13: error: reference to 'prev' is ambiguous prev[(1 << j)][j] = -1; ^~~~ main.cpp:18:28: note: candidates are: int prev [262144][19] int d[1 << 18][NMAX + 1] , prev[1 << 18][NMAX + 1] , fbd; ^~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/string:40, from main.cpp:2: /usr/include/c++/6/bits/stl_iterator_base_funcs.h:217:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^~~~ main.cpp:102:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0 ; k < G[j].size() ; k ++) ~~^~~~~~~~~~~~~ main.cpp:109:29: error: reference to 'prev' is ambiguous prev[bm][G[j][k].nod] = j; ^~~~ main.cpp:18:28: note: candidates are: int prev [262144][19] int d[1 << 18][NMAX + 1] , prev[1 << 18][NMAX + 1] , fbd; ^~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:66:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/string:40, from main.cpp:2: /usr/include/c++/6/bits/stl_iterator_base_funcs.h:217:5: note: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) prev(_BidirectionalIterator __x, typename ^~~~ main.cpp:121:11: error: reference to 'prev' is ambiguous while(prev[l][c] != -1) ^~~~ main.cpp:18:28: note: candidates are: int prev [262144][19] int d[1 << 18][NMAX + 1] , prev[1 << 18][NMAX + 1] , fbd; Non zero exit status: 1