Problem description In these unusual times, what passes for amusement is a pretty broad set of activities (so long as they can be carried out in the bubble!)

computer science

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Problem description In these unusual times, what passes for amusement is a pretty broad set of activities (so long as they can be carried out in the bubble!) Lately, I’ve found myself idling away time just dealing out cards and picking them up again in various different ways.

For instance, if I have a pile of 12 cards I might deal them out face up in four rows of three starting at the top left, dealing a row at a time from left to right, and finishing in the bottom right. If I pick them up again in the same way (keeping them face up in hand and putting new cards on the top of the pile) then that just leaves the pile in the same order as I started. But, there are all sorts of exciting things I might do instead: 

• I might pick them up by columns from top to bottom and left to right; or 

• I might pick them up by columns from top to bottom and right to left; or 

• etc


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