Duck installed infrared alarm in the warehouse, as shown in the figure, all infrared rays do not intersect. The n transmitters and n receivers divide the plane into n + 1 regions, denoted 0, 1, ..., n from left to right, respectively. Now technicians are debugging, for each point, you need to quickly know where it is located. If it is on the infrared, it is considered as the area to the right.

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