for these puzzles you're given a set of letter pairings that you line up into a code via the overlapping letters as an example:

you have pairs "CA", "CO", "DC" and "OD" for a 5-letter code. with the answer being CODCA (contains CO, OD, DC, CA in that order)

  • $\begingroup$ Pattern matching? $\endgroup$
    – Lawrence
    Jul 24 '18 at 6:10
  • $\begingroup$ Pattern matching would be a generic category of puzzle though sadly it's starting to look like this particular puzzle type doesn't have a proper name $\endgroup$
    – Goku Gohan
    Jul 24 '18 at 6:53
  • 1
    $\begingroup$ An interesting term to look up for this puzzle is "Eulerian Path" en.wikipedia.org/wiki/Eulerian_path $\endgroup$
    – LeppyR64
    Jul 24 '18 at 11:06
  • $\begingroup$ @LeppyR64 Quite true. Once you convert the letter pairs into the directed edges of a graph where the nodes are the letters, the puzzle becomes trivial. $\endgroup$ Jul 24 '18 at 12:44
  • $\begingroup$ @JaapScherphuis Or it has a whole bunch of solutions :) $\endgroup$
    – LeppyR64
    Jul 24 '18 at 20:06

It looks like a $1$-dimensional overlapping jigsaw puzzle,

or Marshall Squares in 1d.

They are very easy to make, just type in a string and then partition it accordingly.

For example:


is derived from:


To solve or check for the uniqueness of a solution, we can check all $k!$ permutations, but we can improve on this using a recursive sieved tree algorithm.

First check the opening pairs for successful candidates, and store the result in a new array as [{pair},last letter, remaining array], and repeat the process on the new array.

For example, the new array for my example, starting from:


would contain:


giving only 13 new entries.

The next level should produce entries like:


and repeat until:


for example.

(Note that this means my example is not uniquely defined - ADFDSFSA also works!)

  • $\begingroup$ Yea but I'm not looking to make them I'm looking for a proper name for them or a solver (which is what i was hoping to use the proper name for to see if anyone has written a solver) $\endgroup$
    – Goku Gohan
    Jul 24 '18 at 6:52
  • 1
    $\begingroup$ Your example starts and ends on the same letter, which automatically allows multiple solutions by cyclically shifting parts, i,e. ADSFDFSA -> SADSFDFS -> FSADSFDF -> DFSADSFD -> FDFSADSF -> SFDFSADS -> DSFDFSAD. $\endgroup$ Jul 24 '18 at 13:55
  • $\begingroup$ That's interesting I'm not a programmer my self though I have done some script editing for some IRC bots back when i used to use mIRC and have written a number of .bat files back when I used to use Dos ... how would I go about using that method? (I also know how to use the browsers console(chrome) to some extent) $\endgroup$
    – Goku Gohan
    Jul 25 '18 at 8:37
  • $\begingroup$ you need fairly sophisticated coding skills and a modern language, such as JavaScript, which will work in your browser. Try developer.mozilla.org/en-US for a good reference site. $\endgroup$
    – JMP
    Jul 25 '18 at 9:06

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