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Task
Implement a kind of "some users are typing" system, which can be found in Discord and some other chat clients.
If 1 user (say, Bubbler) is typing, output Bubbler is typing...
If 2 users (say, Bubbler and user) are typing, output Bubbler and user are typing...
If 3 or more users are typing (...
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All distances different on a chessboard
code-golfsequencegeometry
Inspired by this Puzzling SE question: All distances different on a chess board.
Introduction
Lets define a sequence \$a(n), n\ge 1\$ as how many pawns can you put on a \$n \times n\$ chessboard in such a way that all the distances...
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There is a string, format is like this:
1-2,11,44:110-113/321:11-13/401-403:33,45-46,111-113/511:13/
The '/' splits the string into 4 parts, I shorted the string, actually there might be 40 parts for example.
Each part contains only one ':' in it and has to be one, the ':' splits the into 2 sub...
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