Compilare: user.cpp: In function ‘void dist(int)’: user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nod].size();++i) ^ user.cpp:32:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<u.size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:67:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<u.size();++i) ^ user.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<u.size();++i) ^