Compilare: user.cpp: In function ‘void dfs(int&)’: user.cpp:17:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i[nod]=0; i[nod]<Q[nod].size(); i[nod]++) ^ user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i[nod]=0; i[nod]<V[nod].size(); i[nod]++) ^ user.cpp: In function ‘int main()’: user.cpp:49:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<St.size(); i++) ^