Questions tagged [optimization]

general questions about selecting a best element from some set of available alternatives.

346 questions
861 views

What classes of mathematical programs can be solved exactly or approximately, in polynomial time?

I am rather confused by the continuous optimization literature and TCS literature about which types of (continuous) mathematical programs (MPs) can be solved efficiently, and which cannot. The ...
5k views

Is it a rule that discrete problems are NP-hard and continuous problems are not?

In my computer science education, I increasingly notice that most discrete problems are NP-complete (at least), whereas optimizing continuous problems is almost always easily achievable, usually ...
940 views

191 views

the largest element of a matrix product

Given two matrices, I'm interested in finding the largest element of their product. I wonder if it's possible to do it significantly faster than the matrix multiplication the solution seems to require?...
203 views

Expected length of a self-avoiding random walk

We're given an arbitrary graph $G=(V,E)$. A self-avoiding random walk is a random walk such that in each step, a random neighbour which was not previously visited is chosen, if such one exists. ...
248 views

Easy to optimize but hard to evaluate

Are there any known natural examples of optimization problems for which it is much easier to produce an optimal solution than to evaluate the quality of a given candidate solution? For the sake of ...
758 views

Applications of MCTS/UCT

MCTS/UCT is a game tree search method that uses a bandit algorithm to select promising nodes to explore. Games are played to their completion randomly and nodes leading to more wins are explored more ...
178 views

Program Minimization

Circuit Minimization is the problem to minimize the size of a given circuit. Is there anything similar for general programs? In particular my question is - Do there exist algorithms to minimize the ...
2k views

Sorting points such that the minimal Euclidean distance between consecutive points would be maximized

Given a set of points in a 3D Cartesian space, I am looking for an algorithm that will sort these points, such that the minimal Euclidean distance between two consecutive points would be maximized. ...
208 views

Complexity of cycle cancellation with integral capacities and irrational costs

Cycle cancellation is a standard textbook algorithm for computing minimum-cost circulations: As long as the residual graph of the current circulation contains a negative cycle, push as much flow along ...
680 views

Set optimization problem - is it np-complete?

Set $S=\{e_1,\cdots,e_n\}$ is given. For each element $e_i$, we have weight $w_i>0$ and cost $c_i>0$. The goal is findIng the subset $M$ of size $k$ that maximize the following objective ...
459 views

Submodular functions: reference request

I would be very much interested in references to the theory of submodular functions (from basics to advanced). In particular, I am studying approximations to hard optimization problems and I want to ...
2k views

How/Why are linear systems so crucial to computer science?

I've begun to get involved with Mathematical Optimization quite recently and am loving it. It seems a lot of optimization problems can be easily expressed and solved as linear programs (e.g. network ...
585 views

317 views

Heuristics for Optimization

Since it's Friday, it's time for a CW question. I'm looking for heuristics that have wide use in optimization problems. To limit the scope to more 'theory-friendly' heuristics, here are the rules (...
123 views

Shortest string in the intersection of regular languages

Inspired by https://codegolf.stackexchange.com/questions/53310/shortest-universal-maze-exit-string Each of the 138,172 valid mazes can be represented as a DFA with 9 states (including starting and ...