Compilare: user.cpp: In function ‘void df1(int, int)’: user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ^ user.cpp: In function ‘void df2(int, int)’: user.cpp:28:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ^ user.cpp:34:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[nod].size();j++) ^ user.cpp:40:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[tata].size();j++) ^