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Meta
Category Archives: Puzzle
IEEE-754 brain teaser
Here is a small programming brain teaser for the weekend: Assume uf is an unsigned integer with 64 bits that holds the IEEE-754 representation for a binary floating point number of that size. The questions are:
Cut the rope, a tablet is NOT a laptop
Back in 2009 I quickly talked about the obvious revolution in computing that was rolling in the form of mobile phone as computer, and mentioned as well the fact that touch-based interfaces were going to dominate the marketplace because of … Continue reading
Posted in Article, Design, Mobile, Puzzle
3 Comments
Breaking into an Android password manager – Practice
In the last post, we’ve seen some security issues which exist in the Android password manager gbaSafe version 1.1.0a, by analyzing the security description provided in its web site. As described there, even though the system depends on a “master … Continue reading
Posted in Architecture, Mobile, Puzzle, Security
8 Comments
Breaking into an Android password manager – Theory
For some time now I’ve been wanting to research more deeply about the internals of Android. Until now, though, this was just a sentiment. Then, a couple of weeks ago I’ve finally managed to replace my iPhone for an Android … Continue reading
Posted in Architecture, Java, Mobile, Puzzle, Security
5 Comments
Python module for Constraint Solving Problems
The constraint module presented in PyCon Brasil and later on EuroPython 2005 is now available. Here is a trivial example, solving the classical rooks problem: problem = Problem() numpieces = 8 cols = range(numpieces) rows = range(numpieces) problem.addVariables(cols, rows) for … Continue reading
Posted in Conference, Project, Puzzle, Python
5 Comments
Problem of the Week at University of Massachusetts
University of Massachusetts has a very nice Problem of the Week service where they post a new math related problem every monday. At that time they report the percentage of people that correctly answered the question as well. To submit … Continue reading
Posted in Math, Puzzle, Python
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Petals Around the Rose
Petals Around the Rose is an interesting brain teaser. Here is a copy of the game description: The name of the game is Petals Around the Rose. The name of the game is important. The computer will roll five dice … Continue reading
Posted in Puzzle
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