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Solution to http://instagram-engineering.tumblr.com/post/12651721845/instagram-engineering-challenge-the-unshredder in python This is my take on the challenge. - uses a simple idea of a distance metric between pixel columns(slice edges) - no magic "weights" or constants - detects slice width if not given* - fairly robust - could be improved - *very fast* * doesn't work perfectly, sometimes detects widths which are factors of the actual width this is harmless as the unshredder still works