Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:16:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();++i) ^ user.cpp:32:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();++i) ^ user.cpp:35:18: warning: ‘hfiu’ may be used uninitialized in this function [-Wmaybe-uninitialized] L[nod]=L[hfiu]; ^