Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<V[nod].size(); i++) ^ user.cpp:21:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<Q[V[nod][i]].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:56:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<St.size(); i++) ^