Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:22:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i<L[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=1;j<R[i].size(); j++) ^