MINE

There are N fighter aircrafts guarding the sky. Each aircraft flies at a constant altitude and at a constant velocity (vx,vy). In other words, every hour it travels vx km in the X direction and vy km in the Y direction (vx and vy can be negative as well). But there has been a major problem. The weapons systems in all the aircrafts have been disabled by an unknown virus. So they are essentially us