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 "distance and routing labeling schemes for cube free median graphs"):
  Abstract: Distance labeling schemes are schemes that label the vertices of a graph with short labels in such a way that the distance between any two vertices $u$ and $v$ can be determined efficiently by merely inspecting the labels of $u$ and $v$, without using any other information. Similarly, routing labeling schemes label the vertices of a graph in a such a way that given the labels of a source node and a destination node, it is possible to compute efficiently the port number of the edge from the source that heads in the direction of the destination. One of important problems is finding natural classes of graphs admitting distance and/or routing labeling schemes with labels of polylogarithmic size. In this paper, we show that the class of cube-free median graphs on $n$ nodes enjoys distance and routing labeling schemes with labels of $O(\log^3 n)$ bits.

Includes members:
  Member "on density of subgraphs of cartesian products":
    also connected through other hyperedges:
      (none)
  Member "a polynomial time algorithm to compute geodesics in cat 0 cubical complexes":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "shortest paths and convex hulls in 2d complexes with non positive curvature")
  Member "a counterexample to thiagarajan s conjecture on regular event structures":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "1 safe petri nets and special cube complexes equivalence and applications")
  Member "a note on distance labeling in planar graphs":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "shorter labels for routing in trees")
  Member "simpler faster and shorter labels for distances in graphs":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "shorter labels for routing in trees")
  Member "sublinear distance labeling":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "adjacency labelling for planar graphs and beyond")
  Member "distance labeling schemes for trees":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "shorter labels for routing in trees")
  Member "shortest path problem in rectangular complexes of global nonpositive curvature":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "a polynomial time algorithm to compute geodesics in cat 0 cubical complexes")

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.DM(Discrete Mathematics)