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: "finding hitting and packing cycles in subexponential time on unit disk graphs"
  Abstract: We give algorithms with running time $2^{O({\sqrt{k}\log{k}})} \cdot n^{O(1)}$ for the following problems. Given an $n$-vertex unit disk graph $G$ and an integer $k$, decide whether $G$ contains (1) a path on exactly/at least $k$ vertices, (2) a cycle on exactly $k$ vertices, (3) a cycle on at least $k$ vertices, (4) a feedback vertex set of size at most $k$, and (5) a set of $k$ pairwise vertex-disjoint cycles. For the first three problems, no subexponential time parameterized algorithms were previously known. For the remaining two problems, our algorithms significantly outperform the previously best known parameterized algorithms that run in time $2^{O(k^{0.75}\log{k})} \cdot n^{O(1)}$. Our algorithms are based on a new kind of tree decompositions of unit disk graphs where the separators can have size up to $k^{O(1)}$ and there exists a solution that crosses every separator at most $O(\sqrt{k})$ times. The running times of our algorithms are optimal up to the $\log{k}$ factor in the exponent, assuming the Exponential Time Hypothesis.

Connected through hyperedge HE-1 (induced by source paper "decomposition of map graphs with applications"):
  with members:
    - "optimal algorithms for hitting topological minors on graphs of bounded treewidth"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "bidimensionality and geometric graphs"

Connected through hyperedge HE-2 (induced by source paper "hyperbolic intersection graphs and quasi polynomial time"):
  with members:
    - "solving vertex cover in polynomial time on hyperbolic random graphs"
    - "a framework for eth tight algorithms and lower bounds in geometric intersection graphs"
    - "the limited blessing of low dimensionality when 1 1 d is the best possible exponent for d dimensional geometric problems"
    - "subexponential parameterized algorithms for graphs of polynomial growth"
    - "on the diameter of hyperbolic random graphs"
    - "computing the gromov hyperbolicity of a discrete metric space"
    - "complexity dichotomy on partial grid recognition"

Connected through hyperedge HE-3 (induced by source paper "subexponential algorithms for variants of homomorphism problem in string graphs"):
  with members:
    - "planar graphs as l intersection or l contact graphs"
    - "independent feedback vertex set for p_5 free graphs"
    - "optimality program in segment and string graphs"
    - "locally constrained homomorphisms on graphs of bounded treewidth and bounded degree"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "the dichotomy of list homomorphisms for digraphs"

Connected through hyperedge HE-4 (induced by source paper "a framework for eth tight algorithms and lower bounds in geometric intersection graphs"):
  with members:
    - "the dominating set problem in geometric intersection graphs"
    - "the limited blessing of low dimensionality when 1 1 d is the best possible exponent for d dimensional geometric problems"
    - "approximation algorithms for polynomial expansion and low density graphs"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "bidimensionality and geometric graphs"

Connected through hyperedge HE-5 (induced by source paper "optimality program in segment and string graphs"):
  with members:
    - "planar graphs as l intersection or l contact graphs"
    - "generalized feedback vertex set problems on bounded treewidth graphs chordality is the key to single exponential parameterized algorithms"
    - "approximation schemes for independent set and sparse subsets of polygons"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "intersection graphs of segments and exists mathbb r"
    - "quasi polynomial time approximation scheme for sparse subsets of polygons"
    - "a qptas for maximum weight independent set of polygons with polylogarithmically many vertices"
    - "the clique problem in ray intersection graphs"

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)