Compilare: user.cpp: In function ‘void DF(int)’: user.cpp:15:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v[nod].size();i++) { ^ user.cpp: In function ‘int main()’: user.cpp:55:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<sub[i].size();j++) { ^ user.cpp:61:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<sub[i].size();j++) ^