int ccw(const pll& v1, const pll& v2) {
ll p = v1.first* v2.second - v1.second * v2.first;
if (p == 0) return 0;
else if (p < 0) return -1;
return 1;
}
int fff(const pll& v1) {
if (v1.first > 0 && v1.second >= 0) return 1;
else if (v1.first <= 0 && v1.second > 0)return 2;
else if (v1.first < 0 && v1.second <= 0) return 3;
return 4;
}
int my_comp(const pll& a, const pll& b) {
if (fff(a) != fff(b)) return fff(a) < fff(b);
return 0 < ccw(a, b);
}