Compilare: user.cpp: In function ‘void Write()’: user.cpp:27:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Sol.size();++i) ^ user.cpp: In function ‘void Dfs(int)’: user.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Ad[s].size();++i) ^