0_0_34099663_23495.cpp: In function 'int main()': 0_0_34099663_23495.cpp:62:13: error: expected ';' before 'if' if (((ll)dx1*(x21-x11)+(ll)dy1*(y21-y11)>0)&&((ll)dx1*(x21-x12)+(ll)dy1*(y21-y12)<0)) ^