Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:59:12: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] afis(t); ^