|July 20th, 2012|
I want to thread comments: when a comment quotes another comment it's probably a reply, so attach them together to make the conversation clearer. This means figuring out which comments quote which other comments. I tried a brute force way:
Update 2012-07-21: Several commenters suggested a better algorithm: to find all quotes of length N, build a dictionary from all sequences of N words to a list of comments in which they appeared. This is O(n*m) and running it it's much faster. I tested it in IE8, and it loaded quickly instead of freezing the browser. I thought briefly about doing something like this earlier, but wrote it off as using insane amounts of memory. After more people suggested it, I realized it only uses N times as much memory as just storing the comments.
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