Compilare: user.cpp: In function ‘bool check(ll)’: user.cpp:48:17: warning: statement has no effect [-Wunused-value] print(a); ^ user.cpp: In function ‘int main()’: user.cpp:61:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b / i == i || b / i + b / 2 >= b) continue; ^ user.cpp:67:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for0(i, sz) ^ user.cpp:2:39: note: in definition of macro ‘for0’ #define for0(i, n) for(int i = 0; i < n; i++) ^