Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(di = 0; di < e[n].size(); ++di) ^ user.cpp:31:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(di = 0; di < e[nod].size(); ++di) ^ user.cpp:15:13: warning: unused variable ‘aux’ [-Wunused-variable] int aux; ^ user.cpp:14:13: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] int nod; ^