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: "improved distance queries in planar graphs"
  Abstract: There are several known data structures that answer distance queries between two arbitrary vertices in a planar graph. The tradeoff is among preprocessing time, storage space and query time. In this paper we present three data structures that answer such queries, each with its own advantage over previous data structures. The first one improves the query time of data structures of linear space. The second improves the preprocessing time of data structures with a space bound of O(n^(4/3)) or higher while matching the best known query time. The third data structure improves the query time for a similar range of space bounds, at the expense of a longer preprocessing time. The techniques that we use include modifying the parameters of planar graph decompositions, combining the different advantages of existing data structures, and using the Monge property for finding minimum elements of matrices.

Connected through hyperedge HE-1 (induced by source paper "almost optimal distance oracles for planar graphs"):
  with members:
    - "holiest minimum cost paths and flows in surface graphs"
    - "exact distance oracles for planar graphs with failing vertices"
    - "constant query time 1 epsilon approximate distance oracle for planar graphs"
    - "fast and compact exact distance oracle for planar graphs"
    - "better tradeoffs for exact distance oracles in planar graphs"
    - "subquadratic algorithms for the diameter and the sum of pairwise distances in planar graphs"
    - "approximate distance oracles for planar graphs with improved query time space tradeoff"
    - "minimum cut of directed planar graphs in o nloglogn time"

Connected through hyperedge HE-2 (induced by source paper "fast and compact exact distance oracle for planar graphs"):
  with members:
    - "voronoi diagrams on planar graphs and computing the diameter in deterministic tilde o n 5 3 time"
    - "subquadratic algorithms for the diameter and the sum of pairwise distances in planar graphs"
    - "improved bounds for shortest paths in dense distance graphs"
    - "popular conjectures as a barrier for dynamic planar graph algorithms"
    - "approximate distance oracles for planar graphs with improved query time space tradeoff"
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "approximate distance oracles with improved preprocessing time"
    - "linear space approximate distance oracles for planar bounded genus and minor free graphs"

Connected through hyperedge HE-3 (induced by source paper "faster shortest paths in dense distance graphs with applications"):
  with members:
    - "improved bounds for shortest paths in dense distance graphs"
    - "minimum cut of directed planar graphs in o nloglogn time"
    - "computing the girth of a planar graph in linear time"
    - "improved submatrix maximum queries in monge matrices"
    - "maximum st flow in directed planar graphs via shortest paths"
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "multiple source shortest paths in embedded graphs"
    - "multiple source multiple sink maximum flow in directed planar graphs in near linear time"

Connected through hyperedge HE-4 (induced by source paper "linear space approximate distance oracles for planar bounded genus and minor free graphs"):
  with members:
    - "exact distance oracles for planar graphs"
    - "fast precise and dynamic distance queries"
    - "shortest paths in planar graphs with real lengths in o n log 2n log log n time"
    - "ramsey partitions and proximity data structures"
    - "fast construction of nets in low dimensional metrics and their applications"
    - "maintaining information in fully dynamic trees with top trees"
    - "dynamic generators of topologically embedded graphs"

Connected through hyperedge HE-5 (induced by source paper "more compact oracles for approximate distances in planar graphs"):
  with members:
    - "linear space approximate distance oracles for planar bounded genus and minor free graphs"
    - "exact distance oracles for planar graphs"

Connected through hyperedge HE-6 (induced by source paper "exact distance oracles for planar graphs"):
  with members:
    - "more compact oracles for approximate distances in planar graphs"
    - "linear space approximate distance oracles for planar bounded genus and minor free graphs"
    - "min st cut of a planar graph in o n loglog n time"
    - "min st cut oracle for planar graphs with near linear preprocessing time"
    - "shortest paths in planar graphs with real lengths in o n log 2n log log n time"
    - "subgraph isomorphism in planar graphs and related problems"

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)