Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:20: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j=j+1;s[j]!=0&&s[j]!='\n';j++) ^ user.cpp:29:20: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int j=j+1;s[j]!=0&&s[j]!='\n';j++) ^