Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:51:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:113:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v2[i].size();j++) ^