Compilare: user.cpp: In function ‘void bf(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[k].size();i++) ^ user.cpp: In function ‘void df(int)’: user.cpp:25:29: 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:42:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[y].size()&&ok;j++) ^ user.cpp:43:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[v[y][j]].size()&&ok;k++) ^