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 angular resolution for face symmetric drawings"
  Abstract: Let G be a graph that may be drawn in the plane in such a way that all internal faces are centrally symmetric convex polygons. We show how to find a drawing of this type that maximizes the angular resolution of the drawing, the minimum angle between any two incident edges, in polynomial time, by reducing the problem to one of finding parametric shortest paths in an auxiliary graph. The running time is at most O(t^3), where t is a parameter of the input graph that is at most O(n) but is more typically proportional to n^.5.

Connected through hyperedge HE-1 (induced by source paper "angle optimization of graphs embedded in the plane"):
  with members:
    - "drawing trees with perfect angular resolution and polynomial area"
    - "lombardi drawings of graphs"
    - "maximizing the total resolution of graphs"
    - "trees with convex faces and optimal angles"
    - "optimal point placement for mesh smoothing"

Connected through hyperedge HE-2 (induced by source paper "graph theoretic solutions to computational geometry problems"):
  with members:
    - "orientation constrained rectangular layouts"
    - "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"
    - "the traveling salesman problem for cubic graphs"

Connected through hyperedge HE-3 (induced by source paper "recognizing partial cubes in quadratic time"):
  with members:
    - "happy endings for flip graphs"
    - "isometric diamond subgraphs"
    - "upright quad drawing of st planar learning spaces"
    - "the lattice dimension of a graph"
    - "algorithms for drawing media"
    - "algorithms for media"

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)