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: "a constant factor approximation algorithm for the asymmetric traveling salesman problem"
  Abstract: We give a constant-factor approximation algorithm for the asymmetric traveling salesman problem (ATSP). Our approximation guarantee is analyzed with respect to the standard LP relaxation, and thus our result confirms the conjectured constant integrality gap of that relaxation. #R##N#The main idea of our approach is a reduction to Subtour Partition Cover, an easier problem obtained by significantly relaxing the general connectivity requirements into local connectivity conditions. We first show that any algorithm for Subtour Partition Cover can be turned into an algorithm for ATSP while only losing a small constant factor in the performance guarantee. Next, we present a reduction from general ATSP instances to structured instances, on which we then solve Subtour Partition Cover, yielding our constant-factor approximation algorithm for ATSP.

Connected through hyperedge HE-1 (induced by source paper "a constant factor approximation for directed latency in quasi polynomial time"):
  with members:
    - "the asymmetric traveling salesman path lp has constant integrality ratio"
    - "compact provably good lps for orienteering and regret bounded vehicle routing"
    - "an improved integrality gap for asymmetric tsp paths"
    - "approximation algorithms for regret bounded vehicle routing and applications to distance constrained vehicle routing"
    - "improving christofides algorithm for the s t path tsp"
    - "asymmetric traveling salesman path and directed latency problems"

Connected through hyperedge HE-2 (induced by source paper "classification in asymmetric spaces via sample compression"):
  with members:
    - "effective resistance reducing flows spectrally thin trees and asymmetric tsp"
    - "maximum margin multiclass nearest neighbors"
    - "efficient classification for metric data"
    - "quasi metrics similarities and searches aspects of geometry of protein datasets"
    - "fast construction of nets in low dimensional metrics and their applications"

Connected through hyperedge HE-3 (induced by source paper "an improved approximation algorithm for atsp"):
  with members:
    - "the asymmetric traveling salesman path lp has constant integrality ratio"
    - "constant factor approximation for atsp with two edge weights"
    - "approximating atsp by relaxing connectivity"
    - "effective resistance reducing flows spectrally thin trees and asymmetric tsp"

Connected through hyperedge HE-4 (induced by source paper "degree bounded generalized polymatroids and approximating the metric many visits tsp"):
  with members:
    - "time and space optimal algorithms for the many visits tsp"
    - "matroidal degree bounded minimum spanning trees"
    - "on generalizations of network design problems with degree bounds"

Connected through hyperedge HE-5 (induced by source paper "from symmetry to asymmetry generalizing tsp approximations by parametrization"):
  with members:
    - "constant factor approximations for asymmetric tsp on nearly embeddable graphs"
    - "new inapproximability bounds for tsp"

Connected through hyperedge HE-6 (induced by source paper "on a generalization of iterated and randomized rounding"):
  with members:
    - "algorithmic discrepancy beyond partial coloring"
    - "approximation friendly discrepancy rounding"
    - "effective resistance reducing flows spectrally thin trees and asymmetric tsp"
    - "pipage rounding pessimistic estimators and matrix concentration"
    - "entropy optimization and counting"
    - "constructive discrepancy minimization by walking on the edges"
    - "constructive algorithms for discrepancy minimization"

Connected through hyperedge HE-7 (induced by source paper "beating the integrality ratio for s t tours in graphs"):
  with members:
    - "a 1 5 approximation for path tsp"
    - "an improved upper bound on the integrality ratio for the s t path tsp"
    - "approaching frac 3 2 for the s t path tsp"
    - "approximation hardness of graphic tsp on cubic graphs"
    - "improving christofides algorithm for the s t path tsp"

Connected through hyperedge HE-8 (induced by source paper "the asymmetric traveling salesman path lp has constant integrality ratio"):
  with members:
    - "approximating atsp by relaxing connectivity"
    - "an improved integrality gap for asymmetric tsp paths"
    - "asymmetric traveling salesman path and directed latency problems"

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)