Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Approximating Optimal Bidirectional Macro Schemes   Lempel-Ziv is an easy-to-compute member of a wide family of so-called macro
schemes; it restricts pointers to go in one direction only. Optimal
bidirectional macro schemes are NP-complete to find, but they may provide much
better compression on highly repetitive sequences. We consider the problem of
approximating optimal bidirectional macro schemes. We describe a simulated
annealing algorithm that usually converges quickly. Moreover, in some cases, we
obtain bidirectional macro schemes that are provably a 2-approximation of the
optimal. We test our algorithm on a number of artificial repetitive texts and
verify that it is efficient in practice and outperforms Lempel-Ziv, sometimes
by a wide margin.

27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph