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: "fast approximation algorithms for p centres in large delta hyperbolic graphs"
  Abstract: We provide a quasilinear time algorithm for the $p$-center problem with an additive error less than or equal to 3 times the input graph's hyperbolic constant. Specifically, for the graph $G=(V,E)$ with $n$ vertices, $m$ edges and hyperbolic constant $\delta$, we construct an algorithm for $p$-centers in time $O(p(\delta+1)(n+m)\log(n))$ with radius not exceeding $r_p + \delta$ when $p \leq 2$ and $r_p + 3\delta$ when $p \geq 3$, where $r_p$ are the optimal radii. Prior work identified $p$-centers with accuracy $r_p+\delta$ but with time complexity $O((n^3\log n + n^2m)\log(diam(G)))$ which is impractical for large graphs.

Connected through hyperedge HE-1 (induced by source paper "obstructions to a small hyperbolicity in helly graphs"):
  with members:
    - "core congestion is inherent in hyperbolic networks"
    - "node expansions and cuts in gromov hyperbolic graphs"
    - "polynomial bounds for the grid minor theorem"
    - "on the hyperbolicity of small world and tree like random graphs"
    - "euclidean versus hyperbolic congestion in idealized versus experimental networks"

Connected through hyperedge HE-2 (induced by source paper "fast approximation of centrality and distances in hyperbolic graphs"):
  with members:
    - "fast approximation and exact computation of negative curvature parameters of graphs"
    - "core congestion is inherent in hyperbolic networks"
    - "into the square on the complexity of quadratic time solvable problems"

Connected through hyperedge HE-3 (induced by source paper "parameterized approximation algorithms for some location problems in graphs"):
  with members:
    - "from gap eth to fpt inapproximability clique dominating set and more"
    - "structural parameters tight bounds and approximation for k r center"
    - "fixed parameter approximations for k center problems in low highway dimension graphs"
    - "optimal dynamic program for r domination problems over tree decompositions"

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)