Problem Detail: The Adler32 algorithm has a shortcoming as noted on Wikipedia: Jonathan Stone discovered in 2001 that Adler-32 has a weakness for very short messages. He wrote “Briefly, the problem is that, for very short packets, Adler-32 is guaranteed to Read More …
Category: Uncategorized
[Solved]: Regex for the language over ${a,b,c}$ that contain at least two $a$’s but no two consecutive $b$’s
Problem Detail: Like the title says, we have the alphabet $Sigma = {a,b,c}$ and the question is asking for the regular expression of the language $L$ that has the property that all strings in $L$ have at least two consecutive $a$’s Read More …
[Solved]: Select a set of elements from a 2D matrix, such that each element comes from distinct row and column
Problem Detail: We’re facing following problem – an n * n 2D Matrix contains doubles (Java). Find a Set of elements such that Each element in the set comes from a unique row and column combination. That is, once you’ve selected Read More …
[Solved]: Metagame Paradox: what is wrong with this explanation?
Problem Detail: Today I’ve heard about fascinating metagame paradox. I tried to come up with an explanation via Turing Machines formalization (below). Do you know what is the solution to the paradox? (the post content: definition – proposed solution – conclusion) Read More …
[Solved]: Find the smallest summed distances by uniquely pairing elements of one set to elements of another set
Problem Detail: As input I have two sets of points in RN, typically for large N, for example N=40. Supose both sets have m elements: S = s1 … sm T = t1 … tm Semantically both sets are equal, but Read More …
[Solved]: Error-correction code for transmission only with bit-flipping from 0 to 1
Problem Detail: I am using a transmission system that uses a Bloom filter (this part is out of my control). I want to send a small amount of data (32 bits) using this system. For each bit [0,31], I add its Read More …
[Solved]: Recipe book for SAT encodings?
Problem Detail: SAT solvers are getting more and more efficient in solving large instances and are being used as back-ends in various contexts. Every time one wants to use them to solve a problem in a specific domain, he/she has to Read More …
[Solved]: 2-way Graph Partitioning problem
Problem Detail: We have a graph $G=(V,E)$ and we need to divide this graph into two clusters $A$ and $B$. Some pairs of vertices $u$, $v$ should not be in the same cluster, and we define an edge $(u,v) in E$. Read More …
[Solved]: Variation on Insertion Sort
Problem Detail: I’m writing insertion sort in scheme, but due to the difficulty of writing it recursively within the constraints of list processing of scheme, I made what seems like an insignificant change to the “find lowest” or inner loop. I’ll Read More …
[Solved]: What is a stateful computation?
Problem Detail: I am reading about a specific field of probabilistic programming, and trying to understand what the term “stateful computation” means. See: http://projects.csail.mit.edu/church/wiki/Simple_Generative_Models (search for “XRP”) Asked By : Astrid Answered By : Shreesh Stateful computation basically means that the model of Read More …
