Top Answers

1. What are the lesser known but useful data structures?
   91 votes
2. ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage?
   67 votes
3. How does the MapReduce sort algorithm work?
   66 votes
4. Is it possible for a computer to "learn" a regular expression by user-provided examples?
   47 votes
5. How do I create my own URL protocol? (e.g. so://...)
   19 votes