human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "better approximation algorithms for maximum asymmetric traveling salesman and shortest superstring"
  Abstract: In the maximum asymmetric traveling salesman problem (Max ATSP) we are given a complete directed graph with nonnegative weights on the edges and we wish to compute a traveling salesman tour of maximum weight. In this paper we give a fast combinatorial $\frac 34$-approximation algorithm for Max ATSP. It is based on a novel use of {\it half-edges}, matchings and a new method of edge coloring. (A {\it half-edge} of edge $(u,v)$ is informally speaking "either a head or a tail of $(u,v)$".) The current best approximation algorithms for Max ATSP, achieving the approximation guarantee of $\frac 23$, are due to Kaplan, Lewenstein, Shafrir and Sviridenko and Elbassioni, Paluch, van Zuylen. Using a recent result by Mucha, which states that an $\alpha$-approximation algorithm for Max ATSP implies a $(2+\frac{11(1-\alpha)}{9-2\alpha})$-approximation algorithm for the shortest superstring problem (SSP), we obtain also a $(2 \frac{11}{30} \approx 2,3667)$-approximation algorithm for SSP, beating the previously best known (having approximation factor equal to $2 \frac{11}{23} \approx 2,4782$.)

Connected through hyperedge HE-1 (induced by source paper "collapsing superstring conjecture"):
  with members:
    - "hierarchical overlap graph"
    - "a constant factor approximation algorithm for the asymmetric traveling salesman problem"
    - "lyndon words and short superstrings"

Connected through hyperedge HE-2 (induced by source paper "on improving the approximation ratio of the r shortest common superstring problem"):
  with members:
    - "on the greedy algorithm for the shortest common superstring problem with reversals"
    - "approximation hardness of shortest common superstring variants"
    - "lyndon words and short superstrings"

Connected through hyperedge HE-3 (induced by source paper "greedy shortest common superstring approximation in compact space"):
  with members:
    - "linear time construction of compressed text indices in compact space"
    - "from theory to practice plug and play with succinct data structures"
    - "lyndon words and short superstrings"

Connected through hyperedge HE-4 (induced by source paper "a 4 5 approximation algorithm for the maximum traveling salesman problem"):
  with members:
    - "a 7 9 approximation algorithm for the maximum traveling salesman problem"
    - "the geometric maximum traveling salesman problem"

Connected through hyperedge HE-5 (induced by source paper "maximum atsp with weights zero and one via half edges"):
  with members:
    - "a 7 9 approximation algorithm for the maximum traveling salesman problem"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DS(Data Structures and Algorithms)