Compilare: user.cpp: In function ‘int main()’: user.cpp:34:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] edges[x][y] = 1; ^ user.cpp:34:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] edges[x][y] = 1; ^ user.cpp:35:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] G[x].push_back(y); ^ user.cpp:36:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++deg[y]; ^ user.cpp:93:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[next].size(); ++i) { ^ user.cpp:74:9: warning: ‘next’ may be used uninitialized in this function [-Wmaybe-uninitialized] int next; ^