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 traveling salesman problem for cubic graphs"
  Abstract: We show how to find a Hamiltonian cycle in a graph of degree at most three with n vertices, in time O(2^{n/3}) ~= 1.260^n and linear space. Our algorithm can find the minimum weight Hamiltonian cycle (traveling salesman problem), in the same time bound. We can also count or list all Hamiltonian cycles in a degree three graph in time O(2^{3n/8}) ~= 1.297^n. We also solve the traveling salesman problem in graphs of degree at most four, by randomized and deterministic algorithms with runtime O((27/4)^{n/3}) ~= 1.890^n and O((27/4+epsilon)^{n/3}) respectively. Our algorithms allow the input to specify a set of forced edges which must be part of any generated cycle. Our cycle listing algorithm shows that every degree three graph has O(2^{3n/8}) Hamiltonian cycles; we also exhibit a family of graphs with 2^{n/3} Hamiltonian cycles per graph.

Connected through hyperedge HE-1 (induced by source paper "an exact algorithm for tsp in degree 3 graphs via circuit procedure and amortization on connectivity structure"):
  with members:
    - "determinant sums for undirected hamiltonicity"

Connected through hyperedge HE-2 (induced by source paper "spotting trees with few leaves"):
  with members:
    - "representative sets of product families"
    - "representative families a unified tradeoff based approach"
    - "a 2k vertex kernel for maximum internal spanning tree"
    - "mixing color coding related techniques"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "narrow sieves for parameterized paths and packings"
    - "determinant sums for undirected hamiltonicity"
    - "algorithm for finding k vertex out trees and its application to k internal out branching problem"

Connected through hyperedge HE-3 (induced by source paper "fast hamiltonicity checking via bases of perfect matchings"):
  with members:
    - "on problems as hard as cnf sat"
    - "solving weighted and counting variants of connectivity problems parameterized by treewidth deterministically in single exponential time"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "determinant sums for undirected hamiltonicity"
    - "known algorithms on graphs of bounded treewidth are probably optimal"
    - "trimmed moebius inversion and graphs of bounded degree"

Connected through hyperedge HE-4 (induced by source paper "solving weighted and counting variants of connectivity problems parameterized by treewidth deterministically in single exponential time"):
  with members:
    - "on feedback vertex set new measure and new structures"
    - "fast hamiltonicity checking via bases of perfect matchings"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "determinant sums for undirected hamiltonicity"
    - "known algorithms on graphs of bounded treewidth are probably optimal"

Connected through hyperedge HE-5 (induced by source paper "solving connectivity problems parameterized by treewidth in single exponential time"):
  with members:
    - "slightly superexponential parameterized problems"
    - "on feedback vertex set new measure and new structures"
    - "narrow sieves for parameterized paths and packings"
    - "determinant sums for undirected hamiltonicity"
    - "known algorithms on graphs of bounded treewidth are probably optimal"
    - "fpt algorithms for connected feedback vertex set"
    - "approximation schemes for steiner forest on planar graphs and graphs of bounded treewidth"
    - "derandomizing the isolation lemma and lower bounds for circuit size"

Connected through hyperedge HE-6 (induced by source paper "graph theoretic solutions to computational geometry problems"):
  with members:
    - "orientation constrained rectangular layouts"
    - "optimal angular resolution for face symmetric drawings"
    - "area universal rectangular layouts"
    - "testing bipartiteness of geometric intersection graphs"
    - "optimal embedding into star metrics"
    - "trees with convex faces and optimal angles"
    - "algorithms for drawing media"

Connected through hyperedge HE-7 (induced by source paper "the fast intersection transform with applications to counting paths"):
  with members:
    - "finding paths of length k in o 2 k time"
    - "trimmed moebius inversion and graphs of bounded degree"

Connected through hyperedge HE-8 (induced by source paper "exact exponential time algorithms for max internal spanning tree"):
  with members:
    - "algorithm for finding k vertex out trees and its application to k internal out branching problem"
    - "a linear vertex kernel for maximum internal spanning tree"

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)