Compilare: user.cpp: In function ‘void update_aib(int)’: user.cpp:26:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = poss; i < A[nod].AIB.size(); i += lsb(i)) ^ user.cpp: In function ‘void build(int, int, int)’: user.cpp:49:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < A[2 * nod].V.size() && j < A[2 * nod + 1].V.size()) { ^ user.cpp:49:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < A[2 * nod].V.size() && j < A[2 * nod + 1].V.size()) { ^ user.cpp:58:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i < A[2 * nod].V.size(); ++i) ^ user.cpp:60:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; j < A[2 * nod + 1].V.size(); ++j) ^ user.cpp:62:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i <= A[nod].V.size(); ++i) ^ user.cpp:64:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < A[nod].V.size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:153:16: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << Vec[sol] << "\n"; ^