Compilare: user.cpp: In function ‘void dalek(int, int)’: user.cpp:11:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define lim(a) e[a].size() ^ user.cpp:15:25: note: in expansion of macro ‘lim’ for (int i = 0; i < lim(y); i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:9: warning: unused variable ‘a’ [-Wunused-variable] int a =0, b =0; ^ user.cpp:48:15: warning: unused variable ‘b’ [-Wunused-variable] int a =0, b =0; ^