Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:63:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<A[nod].vec.size(); i++) ^ user.cpp:71:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; l <= A[nod].vec.size() - 1 && det(A[nod].vec[0], A[nod].vec[1], A[nod].vec[l]) == 0; ++l); ^ user.cpp:77:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i<A[nod].vec.size(); i++) { ^ user.cpp:95:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i<va.size(); i++) ^ user.cpp: In function ‘bool query(int, int, int)’: user.cpp:126:21: warning: ‘mid’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mid; ^