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: "minimum leaf out branching and related problems"
  Abstract: Given a digraph $D$, the Minimum Leaf Out-Branching problem (MinLOB) is the problem of finding in $D$ an out-branching with the minimum possible number of leaves, i.e., vertices of out-degree 0. We prove that MinLOB is polynomial-time solvable for acyclic digraphs. In general, MinLOB is NP-hard and we consider three parameterizations of MinLOB. We prove that two of them are NP-complete for every value of the parameter, but the third one is fixed-parameter tractable (FPT). The FPT parametrization is as follows: given a digraph $D$ of order $n$ and a positive integral parameter $k$, check whether $D$ contains an out-branching with at most $n-k$ leaves (and find such an out-branching if it exists). We find a problem kernel of order $O(k^2)$ and construct an algorithm of running time $O(2^{O(k\log k)}+n^6),$ which is an `additive' FPT algorithm. We also consider transformations from two related problems, the minimum path covering and the maximum internal out-tree problems into MinLOB, which imply that some parameterizations of the two problems are FPT as well.

Connected through hyperedge HE-1 (induced by source paper "designing deterministic polynomial space algorithms by color coding multivariate polynomials"):
  with members:
    - "directed hamiltonicity and out branchings via generalized laplacians"
    - "spotting trees with few leaves"
    - "complexity results for rainbow matchings"
    - "fast algorithms for parameterized problems with relaxed disjointness constraints"
    - "representative families a unified tradeoff based approach"
    - "mixing color coding related techniques"
    - "abusing the tutte matrix an algebraic instance compression for the k set cycle problem"
    - "narrow sieves for parameterized paths and packings"

Connected through hyperedge HE-2 (induced by source paper "linear kernels for outbranching problems in sparse digraphs"):
  with members:
    - "bidimensionality and kernels"
    - "kernelization and sparseness the case of dominating set"
    - "kernelization using structural parameters on sparse graph classes"
    - "network sparsification for steiner problems on planar and bounded genus graphs"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "problems parameterized by treewidth tractable in single exponential time a logical approach"
    - "beyond bidimensionality parameterized subexponential algorithms on directed graphs"
    - "on finding directed trees with many leaves"

Connected through hyperedge HE-3 (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-4 (induced by source paper "mixing color coding related techniques"):
  with members:
    - "representative sets of product families"
    - "representative families a unified tradeoff based approach"
    - "a 2k vertex kernel for maximum internal spanning tree"
    - "deterministic parameterized algorithms for matching and packing problems"
    - "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"
    - "a linear vertex kernel for maximum internal spanning tree"

Connected through hyperedge HE-5 (induced by source paper "a multivariate framework for weighted fpt algorithms"):
  with members:
    - "representative families a unified tradeoff based approach"
    - "minimum bisection is fixed parameter tractable"
    - "deterministic parameterized connected vertex cover"
    - "vertex cover kernelization revisited upper and lower bounds for a refined parameter"
    - "determinant sums for undirected hamiltonicity"
    - "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"

Connected through hyperedge HE-6 (induced by source paper "a 2k vertex kernel for maximum internal spanning tree"):
  with members:
    - "representative families a unified tradeoff based approach"
    - "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"

Connected through hyperedge HE-7 (induced by source paper "beyond bidimensionality parameterized subexponential algorithms on directed graphs"):
  with members:
    - "efficient computation of representative sets with applications in parameterized and exact algorithms"
    - "subexponential parameterized algorithm for computing the cutwidth of a semi complete digraph"
    - "solving connectivity problems parameterized by treewidth in single exponential time"
    - "faster algorithms for feedback arc set tournament kemeny rank aggregation and betweenness tournament"
    - "on finding directed trees with many leaves"
    - "faster fast feedback arc set in tournaments"
    - "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)