Questions tagged [upper-bound]
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29
questions
2
votes
2answers
61 views
Find both lower and upper asymptotic bounds for $T(n) = 2T(\frac{n}{2})+n^4$
So far we have learned Recursion Tree, Substitution Method, and Master's Theorem.
I'm not sure how we can find lower AND upper bounds.
I know that using Master's Theorem, we get $T(n) = \Theta(n^4)$, ...
1
vote
1answer
36 views
Asymptotics of a sinusoid
Consider the function
$$
f(n) = 2n^2 |\sin(\pi \cdot n/2)|.
$$
Which of the following classes does $f(n)$ belong to?
$$ O(n^2), \Omega(n^2), \Theta(n^2), \omega(n^2), o(n^2). $$
I'm working in this ...
2
votes
1answer
22 views
Proving that there exists a distance $d$-dominating set of size $O(n/\delta)$
Let $d > 1$, and consider a graph $G = (V,E)$ on $n$ vertices. A distance $d$-dominating set of $G$ is a set $D \subseteq V$ with the property that for any $v \in V$, either $v \in D$ or $v$ is at ...
0
votes
0answers
26 views
Huffman - Upperbound Depth Given an alphabet with probabilities
Given an alphabet $\Sigma = \{C_1, ..., C_k\}$ where the probability of the letter $C_k$ is given by $Pr(C_k)$.
The probabilities satisfy $Pr(C_1)> ... >P(C_k)$ (i.e all probabilities are ...
0
votes
0answers
41 views
Correctness of algorithm and its complexity
I am trying to solve problem of generation of so called activity-on-edge (activity-on-arc) network graph given based on given activity-on-node network graph.
So, I found this paper proposing an ...
1
vote
1answer
44 views
Are the following Big Oh Notations equivalent?
In the context of Upper bounds computaion and Big Oh Notation, I was wondering if the following could be proved... if they are equivalent.
$\mathcal{O}((log(n))^{-1}) = (\mathcal{O}(log(n)))^{-1}$
$\...
1
vote
1answer
34 views
How fast can we optimally cluster 1-D data?
K-means clustering is the problem of partitioning a set of points in a metric space into $k$ sets (clusters), such that the sum of squared distances between each point and the center of its cluster) ...
0
votes
1answer
73 views
Do you >have< to define the upper and lower bound? (context: traveling salesman)
Do one have to define the upper and lower bound to be able to solve the tsp, or is that just an unnecessary intermediate step? And if so, why would one define those bounds? (context: the traveling ...
1
vote
2answers
127 views
Why are greedy algorithms used to find upper/lower bounds? (when they doesn't guarantee an optimal solution)
Take the nearest neighbor algorithm for the traveling salesman problem as an example. Why is it used to find the upper bound? When can't it guarantee an optimal solution?
(Thanks to many comments ...
1
vote
1answer
46 views
How to find sets of polynomially bounded numbers whose subset sums are different?
Let $n$ be any positibe integer and set $N=\{1,\dots,n\}$. Now select two arbitrary but different subsets of $N$, say $S$ and $S'$. We are interested in finding a function $\pi(A)=\sum_{i\in A}a_i$ ...
1
vote
1answer
127 views
Asymptotic bound of a recursive function
Consider the following procedure computing a dummy function. Which one is a correct asymptotic bound for the running time of F(N) expressed in terms of N?
...
1
vote
1answer
122 views
Definition of an Upper Bound
The definition my professor gave us is: f(n) is O(g(n) for constant c > 0 and n0 ≥ 0 where all n ≥ n0 and f(n) ≤ cg(n). I was wondering what n0 and n are?
Example:
for the function f(n) = an2+ bn + ...
2
votes
0answers
22 views
Anagram sorting with inversion count oracle
Given a permutation $P$ of an unknown array $U$ of length $N$ and a function $f(Q)$ that calculates the minumum number of swaps between consecutive elements of array $Q$ to reach $U$, what is the ...
2
votes
0answers
83 views
Maximum value reached in extended binary GCD
Given positive integer inputs $x$ and $y$ , with $0<x<y$ and $y$ an odd prime (or $\gcd(x,y)=1$ and $y$ odd), the following algorithm computes $x^{-1}\bmod y$ per the (half-)extended binary GCD. ...
1
vote
0answers
87 views
Hanoi Tower Variation: Place Maximum Number of Balls on $N$ Pegs
Problem Statement. There are many interesting variations on the Tower of Hanoi problem. This version consists of $N$ pegs and one ball containing each number from $1, 2, 3, \dots$ Whenever the sum of ...
2
votes
1answer
80 views
Tight bound on the number of intersections between a line and a triangulation
I'm interested in the maximum number of intersections that a line and a triangulation on $n$ points could have. More specifically, given $n$, we are interested in the worst-case (maximum) number of ...
1
vote
1answer
4k views
how to find upper bound and lower bound of quadratic equation
I am relatively new to algorithms, I wrote one pattern matching algorithm and its running time is $O(n^2)$, I tried it by step count method, direct method and also the constant method which all yields ...
-1
votes
1answer
68 views
Big o notation help? [duplicate]
I'm learning about data structures and have been reading up on upper bounds. Most of the stuff I understand but my professor gave us a problem in class to solve on our own for fun. I'm not sure how to ...
2
votes
1answer
147 views
The upper bound on a Nondeterministic Finite Automata's configurations number
In "Engineering: A Compiler" 2nd ed. by Cooper and Torczon,
in 2.4.1 "Nondeterministic Finite Automata" of Chapter 2,
section "Equivalence of NFAs and DFAs"
discusses the upper bound of a NFA's ...
2
votes
0answers
38 views
What's the reason for sqrt(n) bounds in online learning?
I have a question regarding no-regret algorithms (of online learning). As far as I can see, such algorithms allow the absolute regret up to round $n$, which is $R_n$, to grow by $\sqrt{n}$. So, in the ...
0
votes
1answer
360 views
How to solve a knapsack problem with increased weight limit?
Let us consider the knapsack problem. Given a set $P$ of $n$ items where each item has weight $w_i$ and value $v_i$ for all $i=1,2,\ldots,n$. We have two bins, one has a weight limit of $W$ and the ...
2
votes
1answer
60 views
Finding the (probable) maximum of a large set of integers *without* iterating over all of the values
As in the title, I am trying to find the largest (aka least upper bound) of a (very large) set of integers. Importantly, I do not have direct access to the full list of integers, but I do have a ...
4
votes
1answer
92 views
What is the runtime of the 'Risch Algorithm'?
I have been trying to find the upper bound on the runtime of the 'Risch algorithm' used for finding the integral of mathematical functions, but have been unable to do so.
https://en.wikipedia.org/...
3
votes
1answer
45 views
Upper bounding randomized k-SAT solver
Problem:
Consider a k-SAT solver that assigns values independently uniformly at random to all the variables. Given the formula has $m$ clauses provide an upper bound for the probability of a random ...
8
votes
3answers
161 views
Upper bound of of fib(n+2)
I have a homework problem that is perplexing me because the math is beyond what I have done, although we were told that it was unnecessary to solve this mathematically. Just provide a close upper ...
0
votes
2answers
223 views
Find an upper bound for a Linear Recurrence
Im having a hard time trying to figure out how to find an upper bound to the following recurrence:
$T(N)=T(N-1)+\mathcal{O}(n)$
where i know initially $N=\lfloor\tfrac{n}{logn}\rfloor$
I believe it ...
1
vote
0answers
38 views
maximum bound for edges in graph $G$ if we want shortest cycle stay at $k$ [closed]
In a simple graph $G$, what is the maximum bound for edges if we want shortest cycle stay at $k$.
How we can find this bound for a graph? Have it any formula or technique to calculate it?
thanks in ...
2
votes
0answers
62 views
What is the largest number of Byzantine failures that can be tolerated in an $m$-dimensional hypercube for the consensus problem?
We are given a system with $n$ nodes which have been arranged into the topology of a hypercube of $m$ dimensions. I would like to derive a tight bound on the maximum number of Byzantine failures that ...
3
votes
1answer
46 views
Sum of size of distinct set of descendants $d$ distance from a node $u$, over all $u$ and $d$ is $\mathcal{O}(n\sqrt{n})$
Let's consider a rooted tree $T$ of $n$ nodes. For any node $u$ of the tree, define $L(u,d)$ to be the list of descendants of $u$ that are distance $d$ away from $u$. Let $|L(u,d)|$ denote the number ...
