Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:34:33: 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:65:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < iB[crt].size() ; ++i) ^ user.cpp:83:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < iB[crt].size() ; ++i) ^ user.cpp: In function ‘int query(int)’: user.cpp:107:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < iB[i].size() ; ++j) ^