Divide & Conquer


There are Just a Few Points To

	Check on the Other Side

•

For a point p on the left to be

close to a point q on the right

–

q must be within distance d

of p

–

q must fall within a rectangle

of size d by 2d

•

How many points (on the

right) can fit into such a

rectangle?

–

Any two points on the right

are distance d or more apart

–

Thus there are at most 6

points in the rectangle

d

d

p

d

d

CS409 - Spring 2000

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