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: "time and space optimality of rotor router graph exploration"
  Abstract: We consider the problem of exploration of an anonymous, port-labeled, undirected graph with $n$ nodes and $m$ edges and diameter $D$, by a single mobile agent. Initially the agent does not know the graph topology nor any of the global parameters. Moreover, the agent does not know the incoming port when entering to a vertex. Each vertex is endowed with memory that can be read and modified by the agent upon its visit to that node. However the agent has no operational memory i.e., it cannot carry any state while traversing an edge. In such a model at least $\log_2 d$ bits are needed at each vertex of degree $d$ for the agent to be able to traverse each graph edge. This number of bits is always sufficient to explore any graph in time $O(mD)$ using algorithm Rotor-Router. We show that even if the available node memory is unlimited then time $\Omega(n^3)$ is sometimes required for any algorithm. This shows that Rotor-Router is asymptotically optimal in the worst-case graphs. Secondly we show that for the case of the path the Rotor-Router attains exactly optimal time.

Connected through hyperedge HE-1 (induced by source paper "dispersion of mobile robots in the global communication model"):
  with members:
    - "dispersion of mobile robots the power of randomness"
    - "efficient dispersion of mobile robots on graphs"
    - "efficient dispersion of mobile robots on arbitrary graphs and grids"
    - "dispersion of mobile robots a study of memory time trade offs"
    - "a general lower bound for collaborative tree exploration"
    - "algorithms for rapidly dispersing robot swarms in unknown environments"

Connected through hyperedge HE-2 (induced by source paper "efficient dispersion of mobile robots on graphs"):
  with members:
    - "dispersion of mobile robots a study of memory time trade offs"
    - "a general lower bound for collaborative tree exploration"
    - "deterministic graph exploration with advice"
    - "algorithms for rapidly dispersing robot swarms in unknown environments"

Connected through hyperedge HE-3 (induced by source paper "efficient dispersion of mobile robots on arbitrary graphs and grids"):
  with members:
    - "dispersion of mobile robots the power of randomness"
    - "efficient dispersion of mobile robots on graphs"
    - "dispersion of mobile robots a study of memory time trade offs"
    - "algorithms for rapidly dispersing robot swarms in unknown environments"

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)