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: "online companion caching"
  Abstract: This paper is concerned with online caching algorithms for the (n, k)-companion cache, defined by Brehob et al. (J. Scheduling 6 (2003) 149). In this model the cache is composed of two components: a k-way set-associative cache and a companion fully associative cache of size n. We show that the deterministic competitive ratio for this problem is (n + 1)(k + 1) - 1, and the randomized competitive ratio is O(log n log k) and Ω(log n + log k).

Connected through hyperedge HE-1 (induced by source paper "efficient distributed workload re embedding"):
  with members:
    - "datacenter traffic control understanding techniques and tradeoffs"
    - "toward demand aware networking a theory for self adjusting networks"
    - "online balanced repartitioning"
    - "dynamic balanced graph partitioning"
    - "competitive paging algorithms"

Connected through hyperedge HE-2 (induced by source paper "online tree caching"):
  with members:
    - "compressing ip forwarding tables towards entropy bounds and beyond"
    - "on line file caching"
    - "the k server dual and loose competitiveness for paging"
    - "competitive paging algorithms"

Connected through hyperedge HE-3 (induced by source paper "online balanced repartitioning"):
  with members:
    - "online network design algorithms via hierarchical decompositions"
    - "rent lease or buy randomized algorithms for multislope ski rental"
    - "competitive paging algorithms"

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)