Problem Detail: First off, I am not sure if this is the correct stackexchange site to ask this question on, so moderators can feel free to move it. I am working on an application that identifies an object in an image. Read More …
Category: Uncategorized
[Solved]: Counting elements that are greater than the median of medians
Problem Detail: Short version: I want to know where the $-2$ comes from in the formula on p. 221 of CLRS 3rd edition. Long version: CLRS (3rd ed.) give an algorithm for $O(n)$ worst case arbitrary order statistic of $n$ distinct Read More …
[Solved]: When describing a CS paper, can it be assumed that the meaning of “tick” is known?
Problem Detail: I thinkt this question fits better here than on english.stackexchange. When describing a figure in a computer science paper, is it safe to use “tick” meaning “tick mark”? Examples: … (see the thick line right of tick “17”) meaning Read More …
[Solved]: NP completeness of closest vector problem
Problem Detail: Let $mathcal{B} = {v_1,v_2,ldots,v_k} in mathbb{R}^n$ be linearly independent vectors. Recall that the integer lattice of $mathcal{B}$ is the set $L(mathcal{B})$ of all linear combinations of elements of $mathcal{B}$ using only integers as coefficients. That is $$L(mathcal{B}) = { Read More …
[Solved]: When should you disable all interrupts in a program?
Problem Detail: Consider a machine that has nested interrupts (a higher priority interrupt can interrupt a lower priority one, the current instruction’s address is saved and later restored). Why would a programmer want to disable all interrupts using instructions like x86’s Read More …
[Solved]: Deleted data remains on a disk until?
Problem Detail: I am little bit confused between the two answers below. What is the exact answer of this question? My query is, “Deleted data remains on a disk until…?” The data is overwritten; The recycle bin is emptied. I have Read More …
[Solved]: Alternative graph data structures
Problem Detail: Are there any graph implementation data structures beyond the standard adjacency list/matrix ones? If so, what are they? I welcome experimental ones as well as highly specialized ones. A little background: I’m developing an algorithm that relies heavily on Read More …
[Solved]: Update labels of a tree depending on ancestors of nodes in linear time
Problem Detail: You are given a tree $T=(V,E)$ along with a designated root node $r in V$.The parent of any node $v ne r$, denoted $p(v)$, is defined to be the node adjacent to $v$ in the path from $r$ Read More …
[Solved]: Automata Theory Questions: Rule Trees, Context-Free Grammar, Proving Ambiguity
Problem Detail: I’m currently taking a class in Automata Theory and it’s kicking my butt. I have an assignment that my teacher gave me that consists of three questions. I have no idea where to start. My teacher and I have Read More …
[Solved]: Proving a function is uncomputable
Problem Detail: I am trying to solve the following problem: For each Turing machine $M_k$ and each string $x$ in ${$0,1$}$$^ast$ let $time_k(x)$ = ${$the number of steps executed by $M_k(x)$ if $M_k(x)$$downarrow$ (halts), and $infty$ if $M_k(x)$$uparrow$ (does not halt)$}$ Read More …
