Compilare: user.cpp: In function ‘void dfs(int, 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:57:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0,x=Q[ind][i];j<G[x].size();++j) ^ user.cpp:66:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0,x=Q[ind][i];j<G[x].size();++j) ^