A Deque is a double ended queue, allowing inserting and removing from both ends. In real scenario we can attached it to a Ticket purchasing line, It performs like a queue but some time It happens that some body has purchased the ticket and sudden they come back to ask some thing on front of … Read more
This ACM Paper describes several alternative ways that it has used to represent a rubik’s cube and compares them against eachother. Sadly, I don’t have an account to get the full text but the description states: Seven alternative representations of Rubik’s Cube are presented and compared: a 3-by-3-by-3 array of 3-digit integers; a 6-by-3-by-3 array … Read more
This answer is going to be pretty long, but I hope it helps provide some insight as to where the Fibonacci heap comes from. I’m going to assume that you’re already familiar with binomial heaps and amortized analysis. Motivation: Why Fibonacci Heaps? Before jumping into Fibonacci heaps, it’s probably good to explore why we even … Read more
Yes, a lossy hash table or a LRUCache is a data structure with fast O(1) lookup that will only give false negatives — if you ask if “Have I run test X”, it will tell you either “Yes, you definitely have”, or “I can’t remember”. Forgive the extremely crude pseudocode: setup_test_table(): create test_table( some large … Read more
I think the question needs to be split into two parts – what is a triple and what makes an “RDF triple” so special? Firstly, a triple is, as most of the other commenters here have already pointed out, a statement in “subject/predicate/object” form – i.e. a statement linking one object (subject) to another object(object) … Read more
If you want to get a detailed answer take a look at section 3.8 this paper, which describes the URL-seen test of a modern scraper: In the course of extracting links, any Web crawler will encounter multiple links to the same document. To avoid downloading and processing a document multiple times, a URL-seen test must … Read more
The quote is from Alan Perlis’ Epigrams on Programming, which was published in 1982. The meaning of this quote is embodied well in Lisp, where there are multitudes of functions that operate and deal specifically with lists, and you could accomplish a lot just with lists and the assortment of functions that operate on lists, … Read more
These are basically research topics, and the results are generally given in the form of conclusions, while the statistical data is hidden. One can have statistical analysis on their own data though. For the benchmarks, better go through the implementation details. The 3rd part of the question is a very subjective matter, and the actual … Read more
AVL trees maintain a more rigid balance than red-black trees. The path from the root to the deepest leaf in an AVL tree is at most ~1.44 lg(n+2), while in red black trees it’s at most ~2 lg (n+1). As a result, lookup in an AVL tree is typically faster, but this comes at the … Read more
Perfect Tree: x / \ / \ x x / \ / \ x x x x / \ / \ / \ / \ x x x x x x x x Complete Tree: x / \ / \ x x / \ / \ x x x x / \ / x x … Read more