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This entry was posted by Detro on Tue 4 April, 2006 at 23:51, and is filled under IT / Comp-Sci / Code. Follow any responses to this post through RSS 2.0. You can leave a response or trackback from your own site.
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Why iPhone still ruleZ
about 3 weeks ago - 5 comments
I’m going to make a simple point. And because people that know me think I’m a “unfair-Google-aficionado-that-doesn’t-see-how-evil-Google-is”, I’m going to use Android as victim here.
iPhone ruleZ
Other OS? I’m not even taking into consideration old stuff like Symbian: is just too easy to trash it now-days (Qt is a whole different story though).
Android is great… for [...]
Binary Tree Rebuilder
about 1 month ago - No comments
Imagine you have a Binary Tree, with those characteristics:
Nodes do not respect any order relation – In other words: it’s not a Binary Search Tree of any kind
Every node appears once and only once within the tree
A nice Binary Tree
Then, your little brother passes by your desk and, to upset you, deletes the tree from [...]
Serverless chat to reduce office distance
about 1 month ago - 6 comments
This idea comes out for an old university-time idea: to write a serverless chat application. Of course, I’m aware of the complications and the problems that using Broadcasting could create, so this problems would be took in consideration by design.
But why now? I was thinking of a way to reduce the “office distances”: making easy [...]
iPad Simulator in Video and Comments
about 1 month ago - No comments
I would have just posted it on Twitter, but I have some comments about this video.
One of the first video of the iPad Simulator
Watch it in Full screen at 720p: it help “feeling” the proportions used by Apple in the UI
It clarify how it does execute iPhone apps: they most probably implement the iPhone API [...]
“Bidirectionally multiplied” array
about 1 month ago - No comments
Another small problem before I go to sleep tonight:
There is an array A[N] of N numbers.
You have to compose an array Output[N] such that Output[i] will be equal
to multiplication of all the elements of A[N] except A[i].
For example Output[0] will be multiplication of A[1] to A[N-1] and Output[1]
will be multiplication of A[0] and from A[2] [...]
Use Backtracking to print all Subsets
about 1 month ago - No comments
I’m “studying” this algorithmic technique: Backtracking. This is an algorithmic approach to problem solution that I trust every good Computer Scientist already uses; but taking a good theo-practical look at it is something better.
A Backtracking Tree
I believe you can find enough informations about it online (the 2 links I provided are more than enough), so [...]
Money change problem: Greedy vs. Dyn.Pro.
about 1 month ago - 7 comments
This is a classical problem of Computer Science: it’s used to study both Greedy and Dynamic Programming algorithmic techniques.
I hate having my pocket full of copper!!! -_-
Definition
Given:
A set of n Denominations D[0...n-1] in ascending order, representing a Monetary Coin System
An money amount A, as input
calculate a solution:
S[0...n-1], with 0 <= S[i] <= (A/S[i]) and 0 [...]
Calculate abs(int) without branching
about 1 month ago - 4 comments
For this you need someone to teach it to you: if you made it yourself, then you are a very good Comp-Sci, and you should send your CV to Google ASAP.
Without branching O_o?
Yes, without using any “if ( a < 0 )…”. To do that, you need to refresh how Two’s Complement works, [...]
Pascal’s Triangle generator
about 2 months ago - No comments
What’s Pascal’s Triangle? That’s what it is (Wikipedia has all the theory, if you need).
Pascal’s Triangle first 6 rows
The thing I wrote here is a generator of the n-th row of the triangle, that doesn’t use more then the memory needed to store the solution. Instead of allocating a Triangular Matrix, and building every row [...]
String search in O(n + m)
about 2 months ago - 2 comments
Searching a string inside another string is a very easy task. Given a string A and a string B, start a loop over A from left to right and, for every letter, start an internal loop to see if there is a match with the letters of B.
A ball of string
Pseudo code would look something [...]
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