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: "approximation algorithms for mixed windy and capacitated arc routing problems"
  Abstract: We present approximation algorithms for the directed Rural Postman problem (DRPP), the mixed, windy Rural Postman problem (MWRPP), and the mixed, windy Capacitated Arc Routing problem (MWCARP). We show that $\alpha(n)$-approximations for $n$-vertex metric asymmetric TSP ($\triangle$-ATSP) yield $(\alpha(C) + 1)$-approximations for DRPP, $(\alpha(C)+3)$-approximations for MWRPP, and $O(\alpha(C+1))$-approximations for MWCARP, where $C$ is the number of weakly connected components induced by positive-demand edges and arcs. Combining this with a result from the literature, we obtain $O(\log C/\log \log C)$-approximations for each of the considered problems, which improves to polynomial-time constant-factor approximations if $C \in O(\log n)$. Moreover, since $\alpha$-approximations for DRPP yield $\alpha$-approximations for $\triangle$-ATSP, our result shows that $\triangle$-ATSP and MWCARP are approximation-equivalent up to small factors.

Connected through hyperedge HE-1 (induced by source paper "a parameterized approximation algorithm for the mixed and windy capacitated arc routing problem theory and experiments"):
  with members:
    - "constant factor approximations for capacitated arc routing without triangle inequality"

Connected through hyperedge HE-2 (induced by source paper "a fixed parameter algorithm for a routing open shop problem unit processing times few machines and locations"):
  with members:
    - "a parameterized complexity view on non preemptively scheduling interval constrained jobs few machines small looseness and small slack"
    - "completing partial schedules for open shop with unit processing times and routing"
    - "interval scheduling and colorful independent sets"
    - "parameterized complexity of the k arc chinese postman problem"
    - "structural parameterizations of the mixed chinese postman problem"
    - "parameterized complexity of k chinese postman problem"
    - "parameterized rural postman problem"

Connected through hyperedge HE-3 (induced by source paper "completing partial schedules for open shop with unit processing times and routing"):
  with members:
    - "a parameterized complexity view on non preemptively scheduling interval constrained jobs few machines small looseness and small slack"
    - "interval scheduling and colorful independent sets"
    - "parameterized complexity of the k arc chinese postman problem"
    - "structural parameterizations of the mixed chinese postman problem"
    - "parameterized complexity of k chinese postman 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)