Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:32:29: 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:53:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<gt[ad].size();j++) ^ user.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<gt[x].size();j++) ^