Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:13:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[x].size();++i) ^ user.cpp:18:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<vecini[i].size();++j) ^