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: "the infinite server problem"
  Abstract: We study a variant of the $k$-server problem, the infinite server problem, in which infinitely many servers reside initially at a particular point of the metric space and serve a sequence of requests. In the framework of competitive analysis, we show a surprisingly tight connection between this problem and the $(h,k)$-server problem, in which an online algorithm with $k$ servers competes against an offline algorithm with $h$ servers. Specifically, we show that the infinite server problem has bounded competitive ratio if and only if the $(h,k)$-server problem has bounded competitive ratio for some $k=O(h)$. We give a lower bound of $3.146$ for the competitive ratio of the infinite server problem, which implies the same lower bound for the $(h,k)$-server problem even when $k/h \to \infty$ and holds also for the line metric; the previous known bounds were 2.4 for general metric spaces and 2 for the line. For weighted trees and layered graphs we obtain upper bounds, although they depend on the depth. Of particular interest is the infinite server problem on the line, which we show to be equivalent to the seemingly easier case in which all requests are in a fixed bounded interval away from the original position of the servers. This is a special case of a more general reduction from arbitrary metric spaces to bounded subspaces. Unfortunately, classical approaches (double coverage and generalizations, work function algorithm, balancing algorithms) fail even for this special case.

Connected through hyperedge HE-1 (induced by source paper "reallocating multiple facilities on the line"):
  with members:
    - "the online k taxi problem"
    - "the h k server problem on bounded depth trees"
    - "changing bases multistage optimization for matroids and matchings"
    - "facility location in evolving metrics"
    - "an algorithm for online k means clustering"
    - "dynamic facility location via exponential clocks"
    - "on the computation of fully proportional representation"

Connected through hyperedge HE-2 (induced by source paper "unbounded lower bound for k server against weak adversaries"):
  with members:
    - "fusible hsts and the randomized k server conjecture"
    - "the h k server problem on bounded depth trees"
    - "ramsey type theorems for metric spaces with applications to online problems"
    - "the k server dual and loose competitiveness for paging"
    - "competitive paging algorithms"

Connected through hyperedge HE-3 (induced by source paper "the h k server problem on bounded depth trees"):
  with members:
    - "the k server dual and loose competitiveness for paging"

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)