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: "optimal embedding into star metrics"
  Abstract: We present an O(n^3 log^2 n)-time algorithm for the following problem: given a finite metric space X, create a star-topology network with the points of X as its leaves, such that the distances in the star are at least as large as in X, with minimum dilation. As part of our algorithm, we solve in the same time bound the parametric negative cycle detection problem: given a directed graph with edge weights that are increasing linear functions of a parameter lambda, find the smallest value of lambda such that the graph contains no negative-weight cycles.

Connected through hyperedge HE-1 (induced by source paper "multiple source shortest paths in embedded graphs"):
  with members:
    - "faster parametric shortest path and minimum balance algorithms"
    - "linear space approximate distance oracles for planar bounded genus and minor free graphs"
    - "min st cut oracle for planar graphs with near linear preprocessing time"
    - "minimum cycle basis and all pairs min cut of a planar graph in subquadratic time"
    - "polynomial time approximation schemes for subset connectivity problems in bounded genus graphs"
    - "approximation schemes for steiner forest on planar graphs and graphs of bounded treewidth"
    - "computing shortest non trivial cycles on orientable surfaces of bounded genus in almost linear time"
    - "dynamic generators of topologically embedded graphs"

Connected through hyperedge HE-2 (induced by source paper "optimally fast incremental manhattan plane embedding and planar tight span construction"):
  with members:
    - "bounds on the complexity of halfspace intersections when the bounded faces have small dimension"
    - "embedding into the rectilinear plane in optimal o n2 time"

Connected through hyperedge HE-3 (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"
    - "trees with convex faces and optimal angles"
    - "algorithms for drawing media"
    - "the traveling salesman problem for cubic 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)