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 problem of compatible representatives"
  Abstract: The purpose of this note is to attach a name to a natural class of combinatorial problems and to point out that this class includes many important special cases. We also show that a simple problem of placing nonoverlapping labels on a rectangular map is NP-complete.

Connected through hyperedge HE-1 (induced by source paper "rock climber distance frogs versus dogs"):
  with members:
    - "the k fr echet distance"
    - "four soviets walk the dog improved bounds for computing the frechet distance"
    - "recognizing weakly simple polygons"
    - "an optimal algorithm for minimum link rectilinear paths in triangulated rectilinear domains"
    - "detecting weakly simple polygons"
    - "why walking the dog takes time frechet distance has no strongly subquadratic algorithms unless seth fails"
    - "minimum link paths revisited"

Connected through hyperedge HE-2 (induced by source paper "constrained orthogonal segment stabbing"):
  with members:
    - "approximating dominating set on intersection graphs of rectangles and l frames"
    - "approximating minimum dominating set on string graphs"
    - "the complexity of drawing graphs on few lines and few planes"
    - "approximation algorithms for maximum independent set of pseudo disks"

Connected through hyperedge HE-3 (induced by source paper "tracking paths in planar graphs"):
  with members:
    - "computations by fly automata beyond monadic second order logic"

Connected through hyperedge HE-4 (induced by source paper "who witnesses the witness finding witnesses in the witness is hard and sometimes impossible"):
  with members:
    - "edge matching problems with rotations"
    - "tree residue vertex breaking a new tool for proving hardness"
    - "braid is undecidable"
    - "fun with fonts algorithmic typography"
    - "classic nintendo games are computationally hard"
    - "the complexity of planar counting problems"

Connected through hyperedge HE-5 (induced by source paper "covering and packing of rectilinear subdivision"):
  with members:
    - "line segment covering of cells in arrangements"
    - "on approximating maximum independent set of rectangles"
    - "approximation schemes for maximum weight independent set of rectangles"
    - "approximation algorithms for maximum independent set of pseudo disks"

Connected through hyperedge HE-6 (induced by source paper "computing coverage kernels under restricted settings"):
  with members:
    - "depth distribution in high dimensions"
    - "minimum weight triangulation is np hard"
    - "improved approximation algorithms for geometric set cover"

Connected through hyperedge HE-7 (induced by source paper "planar 3 sat with a clause variable cycle"):
  with members:
    - "the complexity of drawing graphs on few lines and few planes"
    - "on planar variants of the monotone satisfiability problem with bounded variable appearances"
    - "flip distance between triangulations of a simple polygon is np complete"
    - "classic nintendo games are computationally hard"
    - "minimum weight triangulation is np hard"
    - "the complexity of planar counting problems"

Connected through hyperedge HE-8 (induced by source paper "non crossing paths with geographic constraints"):
  with members:
    - "ordered level planarity geodesic planarity and bi monotonicity"
    - "non crossing connectors in the plane"

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)