Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Permutation Generation: Two New Permutation Algorithms   Two completely new algorithms for generating permutations, shift-cursor
algorithm and level algorithm, and their efficient implementations are
presented in this paper. One implementation of the shift cursor algorithm gives
an optimal solution of the permutation generation problem, and one
implementation of the level algorithm can be used to generate random
permutations.

19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph