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 quadratic algorithm for road coloring"
  Abstract: The Road Coloring Theorem states that every aperiodic directed graph with constant out-degree has a synchronized coloring. This theorem had been conjectured during many years as the Road Coloring Problem before being settled by A. Trahtman. Trahtman's proof leads to an algorithm that finds a synchronized labeling with a cubic worst-case time complexity. We show a variant of his construction with a worst-case complexity which is quadratic in time and linear in space. We also extend the Road Coloring Theorem to the periodic case.

Connected through hyperedge HE-1 (induced by source paper "on the number of synchronizing colorings of digraphs"):
  with members:
    - "complexity of road coloring with prescribed reset words"
    - "reset thresholds of automata with two cycle lengths"
    - "fast synchronization of random automata"
    - "synchronizing automata with large reset lengths"
    - "primitive digraphs with large exponents and slowly synchronizing automata"
    - "on the probability of being synchronizable"
    - "practical graph isomorphism ii"
    - "the road coloring problem"

Connected through hyperedge HE-2 (induced by source paper "complexity of road coloring with prescribed reset words"):
  with members:
    - "on the number of synchronizing colorings of digraphs"
    - "a note on a recent attempt to improve the pin frankl bound"
    - "parameterized complexity of synchronization and road coloring"
    - "strong inapproximability of the shortest reset word"
    - "an algorithm for road coloring"
    - "the road coloring problem"

Connected through hyperedge HE-3 (induced by source paper "p l aying for synchronization"):
  with members:
    - "modifying the upper bound on the length of minimal synchronizing word"
    - "the road coloring problem"

Connected through hyperedge HE-4 (induced by source paper "an algorithm for road coloring"):
  with members:
    - "slowly synchronizing automata and digraphs"
    - "a subquadratic algorithm for road coloring"
    - "the road coloring problem"

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)