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Re:Instagram Engineering Challenge: The Unshredder by Luyt on Saturday November 12, 2011 @01:50PM (#3228513)
Currently I'm using a matrix to determine adjacency, but I'll give this graph idea a try. Thanks for the tip!

PS. Have you actually realized a succesful implementation? (Just curious)

Re:Instagram Engineering Challenge: The Unshredder by webfuel on Saturday November 12, 2011 @02:42PM (#3228683)
No problem! Yes, I have this working:

http://webfuel.org/instaunshredderv2.php

It also works on the test images I created:

http://webfuel.org/a.png http://webfuel.org/b.png http://webfuel.org/c.png