Compilare: user.cpp: In function ‘void df(int)’: user.cpp:13:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ^ user.cpp: In function ‘void df1(int)’: user.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++){ ^ user.cpp:22:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<a[nod].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:31:8: warning: unused variable ‘y’ [-Wunused-variable] int x,y;dat h; ^