Compilare: user.cpp: In function ‘int main()’: user.cpp:22:9: warning: unused variable ‘a’ [-Wunused-variable] int a,b; ^ user.cpp:22:11: warning: unused variable ‘b’ [-Wunused-variable] int a,b; ^ user.cpp: In function ‘void dp(int, int)’: user.cpp:60:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘void df(int, int)’: user.cpp:79:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0,f;i<v[nod].size();i++) ^