human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "almost all even yao yao graphs are spanners"):
  Abstract: It is an open problem whether Yao-Yao graphs YYk (also known as sparse-Yao graphs) are all spanners when the integer parameter k is large enough. In this paper we show that, for any integer k ≥ 42, the Yao-Yao graph YY2k is a tk-spanner, with stretch factor tk = 6.03 +O(k −1) when k tends to infinity. Our result generalizes the best known result which asserts that all YY6k are spanners for k ≥ 6 [Bauer and Damian, SODA’13]. Our proof is also somewhat simpler.

Includes members:
  Member "new and improved spanning ratios for yao graphs":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "truly optimal euclidean spanners")
  Member "an infinite class of sparse yao spanners":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "truly optimal euclidean spanners")
  Member "π 2 angle yao graphs are spanners":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "truly optimal euclidean spanners")
  Member "a simple yao yao based spanner of bounded degree":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "odd yao yao graphs may not be spanners")
  Member "on the stretch factor of convex delaunay graphs":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "angle monotone graphs construction and local routing")

Question: Please tell me which class the source paper 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)