ent font-content"><div style="position: relative; overflow: hidden;"><div>Teacher Mai has a kingdom with the infinite area.</div>
<div></div>
<div>He has n students guarding the kingdom.</div>
<div></div>
<div>The i-th student stands at the position (xi,yi), and his walking speed is vi.</div>
<div></div>
<div>If a point can be reached by a student, and the time this student walking to this point is strictly less than other students, this point is in the charge of this student.</div>
<div></div>
<div