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: "better algorithms and bounds for directed maximum leaf problems"
  Abstract: The {\sc Directed Maximum Leaf Out-Branching} problem is to find an out-branching (i.e. a rooted oriented spanning tree) in a given digraph with the maximum number of leaves. In this paper, we improve known parameterized algorithms and combinatorial bounds on the number of leaves in out-branchings. We show that #R##N#\begin{itemize} \item every strongly connected digraph $D$ of order $n$ with minimum in-degree at least 3 has an out-branching with at least $(n/4)^{1/3}-1$ leaves; \item if a strongly connected digraph $D$ does not contain an out-branching with $k$ leaves, then the pathwidth of its underlying graph is $O(k\log k)$; \item it can be decided in time $2^{O(k\log^2 k)}\cdot n^{O(1)}$ whether a strongly connected digraph on $n$ vertices has an out-branching with at least $k$ leaves. \end{itemize} #R##N#All improvements use properties of extremal structures obtained after applying local search and of some out-branching decompositions.

Connected through hyperedge HE-1 (induced by source paper "minimum leaf out branching and related problems"):
  with members:
    - "algorithm for finding k vertex out trees and its application to k internal out branching problem"
    - "parameterized algorithms for directed maximum leaf problems"
    - "an fpt algorithm for directed spanning k leaf"
    - "fixed parameter complexity of minimum profile problems"
    - "the linear arrangement problem parameterized above guaranteed value"

Connected through hyperedge HE-2 (induced by source paper "fpt algorithms and kernels for the directed k leaf problem"):
  with members:
    - "spanning directed trees with many leaves"
    - "parameterized algorithms for directed maximum leaf problems"
    - "an fpt algorithm for directed spanning k leaf"

Connected through hyperedge HE-3 (induced by source paper "tight bounds and faster algorithms for directed max leaf problems"):
  with members:
    - "parameterized algorithms for directed maximum leaf problems"
    - "an fpt algorithm for directed spanning k leaf"

Connected through hyperedge HE-4 (induced by source paper "spanning directed trees with many leaves"):
  with members:
    - "parameterized algorithms for directed maximum leaf problems"
    - "an fpt algorithm for directed spanning k leaf"

Connected through hyperedge HE-5 (induced by source paper "kernel s for problems with no kernel on out trees with many leaves"):
  with members:
    - "parameterized algorithms for directed maximum leaf problems"

Connected through hyperedge HE-6 (induced by source paper "an fpt algorithm for directed spanning k leaf"):
  with members:
    - "parameterized algorithms for directed maximum leaf problems"

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)