Compilare: user.cpp: In constructor ‘arb::arb(const std::vector<int>&)’: user.cpp:15:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(lmax=1;(1<<lmax)<x.size();lmax++);lmax=(1<<lmax); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:72:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘void make_path()’: user.cpp:96:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<path.size();i++) ^