Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[v].size();i++) ^ user.cpp: In function ‘int f(int)’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[v].size();i++) ^