Description

Before computers were widely used, there was another fairly convenient way of archiving data, where librarians archived periodicals on microfiches. A microfiche is a rectangular card made of high-resolution magnet that can store the image of a newspaper page on an area as small as one square millimeter. One may view the newspaper from a microfiche by a device with strong magnification capability. In order to keep a large microfiche collection in perfect order and provide good search service to the users, Gholam, one ingenious librarian, invented a microfiche storage machine.

There are n microfiches in the collection, and each of them has a unique id number. There is a catalogue that allows one to easily find the id number of the microfiche desired.

Gholam proposes to put each microfiche in a special frame, as shown in the figure below. The upper left corner of the frame is clipped, to make sure that there is only one orientation possible for a framed microfiche in its stack (explained below).

统计

递交统计

Microfiches

信息

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