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: "obtaining a planar graph by vertex deletion"
  Abstract: In the k-Apex problem the task is to find at most k vertices whose deletion makes the given graph planar. The graphs for which there exists a solution form a minor closed class of graphs, hence by the deep results of Robertson and Seymour, there is an O(n^3) time algorithm for every fixed value of k. However, the proof is extremely complicated and the constants hidden by the big-O notation are huge. Here we give a much simpler algorithm for this problem with quadratic running time, by iteratively reducing the input graph and then applying techniques for graphs of bounded treewidth.

Connected through hyperedge HE-1 (induced by source paper "hitting topological minor models in planar graphs is fixed parameter tractable"):
  with members:
    - "the planar directed k vertex disjoint paths problem is fixed parameter tractable"
    - "obtaining planarity by contracting few edges"
    - "finding topological subgraphs is fixed parameter tractable"

Connected through hyperedge HE-2 (induced by source paper "planar disjoint paths in linear time"):
  with members:
    - "a lower bound on the tree width of graphs with irrelevant vertices"
    - "finding topological subgraphs is fixed parameter tractable"

Connected through hyperedge HE-3 (induced by source paper "a deterministic polynomial kernel for odd cycle transversal and vertex multiway cut in planar graphs"):
  with members:
    - "bidimensionality and kernels"
    - "uniform kernelization complexity of hitting forbidden minors"
    - "representative sets and irrelevant vertices new tools for kernelization"
    - "compression via matroids a randomized polynomial kernel for odd cycle transversal"
    - "large isolating cuts shrink the multiway cut"
    - "on multiway cut parameterized above lower bounds"

Connected through hyperedge HE-4 (induced by source paper "structural rounding approximation algorithms for graphs near an algorithmically tractable class"):
  with members:
    - "approximate generalized matching f factors and f edge covers"
    - "optimal dynamic program for r domination problems over tree decompositions"
    - "inapproximability of h transversal packing"
    - "tight running time lower bounds for vertex deletion problems"
    - "polynomial bounds for the grid minor theorem"
    - "approximation algorithms for maximum independent set of pseudo disks"

Connected through hyperedge HE-5 (induced by source paper "polylogarithmic approximation for minimum planarization almost"):
  with members:
    - "beyond the euler characteristic approximating the genus of general graphs"
    - "approximation algorithms for euler genus and related problems"
    - "grid minors in damaged grids"
    - "on graph crossing number and edge planarization"
    - "an algorithm for the graph crossing number problem"

Connected through hyperedge HE-6 (induced by source paper "deleting vertices to graphs of bounded genus"):
  with members:
    - "a tight lower bound for vertex planarization on graphs of bounded treewidth"

Connected through hyperedge HE-7 (induced by source paper "simultaneous feedback vertex set a parameterized perspective"):
  with members:
    - "a note on finding dual feedback vertex set"
    - "tight running time lower bounds for vertex deletion problems"
    - "faster deterministic feedback vertex set"
    - "interval deletion is fixed parameter tractable"
    - "linear kernels and single exponential algorithms via protrusion decompositions"
    - "faster parameterized algorithms using linear programming"
    - "representative sets and irrelevant vertices new tools for kernelization"
    - "solving connectivity problems parameterized by treewidth in single exponential time"

Connected through hyperedge HE-8 (induced by source paper "parameterizing the permanent genus apices minors evaluation mod 2 k"):
  with members:
    - "exponential time complexity of the permanent and the tutte polynomial"
    - "complexity of counting subgraphs only the boundedness of the vertex cover number counts"
    - "counting perfect matchings in graphs that exclude a single crossing minor"
    - "everything you always wanted to know about the parameterized complexity of subgraph isomorphism but were afraid to ask"

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)