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: "approximate distance oracle with constant query time"
  Abstract: An approximate distance oracle is a succinct data structure that provides fast answers to distance queries between any two nodes. In this paper we consider approximate distance oracles for general undirected graphs with non-negative edge weights with constant query time. We present a distance oracle of size O(k n^{1+1/k}), with 2k-1 stretch and O(1) query time. This improves the O(log{k}) query time of Wulff-Nilsen's distance oracle [SODA '13], which in turn improved the O(k) query time of Thorup and Zwick's distance oracle [J. ACM '05].

Connected through hyperedge HE-1 (induced by source paper "almost shortest paths and pram distance oracles in weighted graphs"):
  with members:
    - "thorup zwick emulators are universally optimal hopsets"
    - "efficient algorithms for constructing very sparse spanners and emulators"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "hopsets with constant hopbound and applications to approximate shortest paths"
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "parallel metric tree embedding based on an algebraic view on moore bellman ford"
    - "the 4 3 additive spanner exponent is tight"
    - "a deterministic almost tight distributed algorithm for approximating single source shortest paths"

Connected through hyperedge HE-2 (induced by source paper "on the hardness of set disjointness and set intersection with bounded universe"):
  with members:
    - "how hard is it to find honest witnesses"
    - "conditional lower bounds for space time tradeoffs"
    - "data structure lower bounds for document indexing problems"
    - "dynamic set intersection"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "on hardness of jumbled indexing"
    - "higher lower bounds from the 3sum conjecture"
    - "exact weight subgraphs and the k sum conjecture"

Connected through hyperedge HE-3 (induced by source paper "labelings vs embeddings on distributed representations of distances"):
  with members:
    - "lossless prioritized embeddings"
    - "almost optimal distance oracles for planar graphs"
    - "nonlinear dimension reduction via outer bi lipschitz extensions"
    - "optimal terminal dimensionality reduction in euclidean space"
    - "metric embedding via shortest path decompositions"
    - "ramsey spanning trees and their applications"
    - "on notions of distortion and an almost minimum spanning tree with constant average distortion"
    - "prioritized metric structures and embedding"

Connected through hyperedge HE-4 (induced by source paper "faster approximation algorithms for computing shortest cycles on weighted graphs"):
  with members:
    - "towards tight approximation bounds for graph diameter and eccentricities"
    - "fully polynomial fpt algorithms for some classes of bounded clique width graphs"
    - "new subquadratic approximation algorithms for the girth"
    - "tight hardness for shortest cycles and paths in sparse graphs"
    - "on the power of tree depth for fully polynomial fpt algorithms"
    - "approximating cycles in directed graphs fast algorithms for girth and roundtrip spanners"
    - "subtree isomorphism revisited"
    - "polynomial fixed parameter algorithms a case study for longest path on interval graphs"

Connected through hyperedge HE-5 (induced by source paper "ramsey spanning trees and their applications"):
  with members:
    - "a new efficient construction on probabilistic tree embeddings"
    - "the 4 3 additive spanner exponent is tight"
    - "approximate distance oracles with improved query time"
    - "ramsey partitions and proximity data structures"
    - "ramsey type theorems for metric spaces with applications to online problems"
    - "lower stretch spanning trees"

Connected through hyperedge HE-6 (induced by source paper "constant query time 1 epsilon approximate distance oracle for planar graphs"):
  with members:
    - "approximate distance oracles for planar graphs with improved query time space tradeoff"
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "approximating the diameter of planar graphs in near linear time"
    - "exact distance oracles for planar graphs"

Connected through hyperedge HE-7 (induced by source paper "approximate distance oracles for planar graphs with improved query time space tradeoff"):
  with members:
    - "approximate distance oracles with improved query time"
    - "approximate distance oracles with improved preprocessing time"
    - "linear space approximate distance oracles for planar bounded genus and minor free graphs"
    - "exact distance oracles for planar graphs"
    - "ramsey partitions and proximity data structures"

Connected through hyperedge HE-8 (induced by source paper "efficient construction of probabilistic tree embeddings"):
  with members:
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "parallel metric tree embedding based on an algebraic view on moore bellman ford"
    - "improved parallel algorithms for spanners and hopsets"
    - "approximate distance oracles with improved query time"
    - "ramsey partitions and proximity data structures"

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)