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: "hitting diamonds and growing cacti"
  Abstract: We consider the following NP-hard problem: in a weighted graph, find a minimum cost set of vertices whose removal leaves a graph in which no two cycles share an edge. We obtain a constant-factor approximation algorithm, based on the primal-dual method. Moreover, we show that the integrality gap of the natural LP relaxation of the problem is \Theta(\log n), where n denotes the number of vertices in the graph.

Connected through hyperedge HE-1 (induced by source paper "losing treewidth by separating subsets"):
  with members:
    - "linear kernels for edge deletion problems to immersion closed graph classes"
    - "parameterized vertex deletion problems for hereditary graph classes with a block property"
    - "approximation and kernelization for chordal vertex deletion"
    - "a single exponential fixed parameter algorithm for distance hereditary vertex deletion"
    - "lp based robust algorithms for noisy minor free and bounded treewidth graphs"
    - "partitioning a graph into small pieces with applications to path transversal"
    - "on the computational complexity of vertex integrity and component order connectivity"
    - "polynomial bounds for the grid minor theorem"

Connected through hyperedge HE-2 (induced by source paper "polylogarithmic approximation algorithms for weighted mathcal f deletion problems"):
  with members:
    - "feedback vertex set inspired kernel for chordal vertex deletion"
    - "approximation and kernelization for chordal vertex deletion"
    - "bidimensionality and kernels"
    - "lp based robust algorithms for noisy minor free and bounded treewidth graphs"
    - "bidimensionality and geometric graphs"
    - "hitting forbidden minors approximation and kernelization"
    - "bidimensionality and eptas"

Connected through hyperedge HE-3 (induced by source paper "an o log opt approximation for covering and packing minor models of theta _r"):
  with members:
    - "large treewidth graph decompositions and applications"

Connected through hyperedge HE-4 (induced by source paper "hitting and harvesting pumpkins"):
  with members:
    - "on feedback vertex set new measure and new structures"
    - "a single exponential fpt algorithm for the k_4 minor cover problem"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "hitting forbidden minors approximation and kernelization"
    - "known algorithms on graphs of bounded treewidth are probably optimal"

Connected through hyperedge HE-5 (induced by source paper "improved region growing and combinatorial algorithms for k route cut problems"):
  with members:
    - "parameters of two prover one round game and the hardness of connectivity problems"
    - "label cover instances with large girth and the hardness of approximating basic k spanner"
    - "approximation algorithms and hardness of the k route cut problem"
    - "region growing for multi route cuts"

Connected through hyperedge HE-6 (induced by source paper "planar f deletion approximation and optimal fpt algorithms"):
  with members:
    - "on feedback vertex set new measure and new structures"
    - "hitting and harvesting pumpkins"
    - "linear kernels on graphs excluding topological minors"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "bidimensionality and geometric graphs"
    - "hitting forbidden minors approximation and kernelization"
    - "a quartic kernel for pathwidth one vertex deletion"
    - "bidimensionality and eptas"

Connected through hyperedge HE-7 (induced by source paper "hitting forbidden minors approximation and kernelization"):
  with members:
    - "bidimensionality and kernels"
    - "a quartic kernel for pathwidth one vertex deletion"
    - "solving dominating set in larger classes of graphs fpt algorithms and polynomial kernels"
    - "solving max r sat above a tight lower bound"
    - "polynomial kernelizations for min f pi_1 and max np"

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)