Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:87:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:93:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[1].size();i++) ^