Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:13:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:32:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<R[x].size();++j) ^ user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(S[x].size()<k&&!H.empty()) ^ user.cpp:43:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(++L[now.second]<S[now.second].size()) ^