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: "rectangular layouts and contact graphs"
  Abstract: Contact graphs of isothetic rectangles unify many concepts from applications including VLSI and architectural design, computational geometry, and GIS. Minimizing the area of their corresponding {\em rectangular layouts} is a key problem. We study the area-optimization problem and show that it is NP-hard to find a minimum-area rectangular layout of a given contact graph. We present O(n)-time algorithms that construct $O(n^2)$-area rectangular layouts for general contact graphs and $O(n\log n)$-area rectangular layouts for trees. (For trees, this is an $O(\log n)$-approximation algorithm.) We also present an infinite family of graphs (rsp., trees) that require $\Omega(n^2)$ (rsp., $\Omega(n\log n)$) area. #R##N#We derive these results by presenting a new characterization of graphs that admit rectangular layouts using the related concept of {\em rectangular duals}. A corollary to our results relates the class of graphs that admit rectangular layouts to {\em rectangle of influence drawings}.

Connected through hyperedge HE-1 (induced by source paper "triangle free penny graphs degeneracy choosability and edge count"):
  with members:
    - "contact representations of sparse planar graphs"
    - "combinatorial properties of triangle free rectangle arrangements and the squarability problem"

Connected through hyperedge HE-2 (induced by source paper "improved approximation algorithms for box contact representations"):
  with members:
    - "semantic word cloud representations hardness and approximation algorithms"
    - "lexrank graph based lexical centrality as salience in text summarization"

Connected through hyperedge HE-3 (induced by source paper "pixel and voxel representations of graphs"):
  with members:
    - "1 visibility representations of 1 planar graphs"
    - "bar 1 visibility graphs and their relation to other nearly planar graphs"
    - "equilateral l contact graphs"
    - "on triangulating k outerplanar graphs"
    - "computing cartograms with optimal complexity"
    - "optimal polygonal representation of planar graphs"

Connected through hyperedge HE-4 (induced by source paper "contact representations of graphs in 3d"):
  with members:
    - "the galois complexity of graph drawing why numerical solutions are ubiquitous for force directed spectral and circle packing drawings"
    - "equilateral l contact graphs"

Connected through hyperedge HE-5 (induced by source paper "primal dual representations of planar graphs and l contact representations of optimal 1 planar graphs"):
  with members:
    - "the galois complexity of graph drawing why numerical solutions are ubiquitous for force directed spectral and circle packing drawings"
    - "equilateral l contact graphs"

Connected through hyperedge HE-6 (induced by source paper "on contact graphs with cubes and proportional boxes"):
  with members:
    - "optimal polygonal representation of planar graphs"

Connected through hyperedge HE-7 (induced by source paper "the flip diameter of rectangulations and convex subdivisions"):
  with members:
    - "adjacency preserving spatial treemaps"
    - "compact floor planning via orderly spanning trees"

Connected through hyperedge HE-8 (induced by source paper "computing cartograms with optimal complexity"):
  with members:
    - "optimal polygonal representation of planar graphs"
    - "area universal rectangular layouts"
    - "compact floor planning via orderly spanning trees"

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)