Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:36:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[node].size();++i) ^ user.cpp: In function ‘void update(int, int, int)’: user.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < iB[crt].size() ; ++i) ^ user.cpp:77:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < iB[crt].size() ; ++i) ^