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: "treewidth computation and extremal combinatorics"
  Abstract: For a given graph G and integers b,f >= 0, let S be a subset of vertices of G of size b+1 such that the subgraph of G induced by S is connected and S can be separated from other vertices of G by removing f vertices. We prove that every graph on n vertices contains at most n\binom{b+f}{b} such vertex subsets. This result from extremal combinatorics appears to be very useful in the design of several enumeration and exact algorithms. In particular, we use it to provide algorithms that for a given n-vertex graph G - compute the treewidth of G in time O(1.7549^n) by making use of exponential space and in time O(2.6151^n) and polynomial space; - decide in time O(({\frac{2n+k+1}{3})^{k+1}\cdot kn^6}) if the treewidth of G is at most k; - list all minimal separators of G in time O(1.6181^n) and all potential maximal cliques of G in time O(1.7549^n). This significantly improves previous algorithms for these problems.

Connected through hyperedge HE-1 (induced by source paper "a heuristic use of dynamic programming to upperbound treewidth"):
  with members:
    - "positive instance driven dynamic programming for treewidth"
    - "a complete anytime algorithm for treewidth"

Connected through hyperedge HE-2 (induced by source paper "clustering to given connectivities"):
  with members:
    - "reducing cmso model checking to highly connected graphs"
    - "parameterized algorithms for partitioning graphs into highly connected clusters"
    - "clustering with local restrictions"
    - "finding connected secluded subgraphs"
    - "spanning circuits in regular matroids"
    - "fully polynomial time parameterized computations for graphs and matrices of low treewidth"
    - "parameterized algorithms for min max multiway cut and list digraph homomorphism"
    - "a short survey on data clustering algorithms"

Connected through hyperedge HE-3 (induced by source paper "extensor coding"):
  with members:
    - "homomorphisms are a good basis for counting small subgraphs"
    - "a dichotomy theorem for nonuniform csps"
    - "the proof of csp dichotomy conjecture"
    - "clifford algebras meet tree decompositions"
    - "complexity of counting subgraphs only the boundedness of the vertex cover number counts"
    - "mixing color coding related techniques"
    - "efficient computation of representative sets with applications in parameterized and exact algorithms"
    - "narrow sieves for parameterized paths and packings"

Connected through hyperedge HE-4 (induced by source paper "finding connected secluded subgraphs"):
  with members:
    - "finding secluded places of special interest in graphs"
    - "designing fpt algorithms for cut problems using randomized contractions"

Connected through hyperedge HE-5 (induced by source paper "positive instance driven dynamic programming for treewidth"):
  with members:
    - "a complete anytime algorithm for treewidth"

Connected through hyperedge HE-6 (induced by source paper "combining treewidth and backdoors for csp"):
  with members:
    - "discovering archipelagos of tractability for constraint satisfaction and counting"
    - "on backdoors to tractable constraint languages"
    - "designing fpt algorithms for cut problems using randomized contractions"
    - "strong backdoors to bounded treewidth sat"
    - "tractable hypergraph properties for constraint satisfaction and conjunctive queries"
    - "hypertree decompositions and tractable queries"

Connected through hyperedge HE-7 (induced by source paper "parameterized complexity of secluded connectivity problems"):
  with members:
    - "kernelization lower bounds by cross composition"
    - "secluded connectivity problems"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "kernels for below upper bound parameterizations of the hitting set and directed dominating set problems"

Connected through hyperedge HE-8 (induced by source paper "on the number of minimal separators in graphs"):
  with members:
    - "large induced subgraphs via triangulations and cmso"
    - "a universally fastest algorithm for max 2 sat max 2 csp and everything in between"
    - "finding induced subgraphs via minimal triangulations"

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)