Compilare: user.cpp: In member function ‘void aib::update(int, int)’: user.cpp:25:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; pos < v.size(); pos += lsb(pos)) ^ user.cpp:28:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (pos = 1; pos < v.size(); pos += lsb(pos)) ^ user.cpp: In function ‘int query(int)’: user.cpp:129:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (which_pos[node] + 2 <= paths[which_path[node]].nodes.size()) ^