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: "better tradeoffs for exact distance oracles in planar graphs"
  Abstract: We present an $O(n^{1.5})$-space distance oracle for directed planar graphs that answers distance queries in $O(\log n)$ time. Our oracle both significantly simplifies and significantly improves the recent oracle of Cohen-Addad, Dahlgaard and Wulff-Nilsen [FOCS 2017], which uses $O(n^{5/3})$-space and answers queries in $O(\log n)$ time. We achieve this by designing an elegant and efficient point location data structure for Voronoi diagrams on planar graphs. #R##N#We further show a smooth tradeoff between space and query-time. For any $S\in [n,n^2]$, we show an oracle of size $S$ that answers queries in $\tilde O(\max\{1,n^{1.5}/S\})$ time. This new tradeoff is currently the best (up to polylogarithmic factors) for the entire range of $S$ and improves by polynomial factors over all the previously known tradeoffs for the range $S \in [n,n^{5/3}]$.

Connected through hyperedge HE-1 (induced by source paper "planar diameter via metric compression"):
  with members:
    - "exact distance oracles for planar graphs with failing vertices"
    - "minor excluded network families admit fast distributed algorithms"
    - "distributed treewidth computation"
    - "faster distributed shortest path approximations via shortcuts"
    - "constant query time 1 epsilon approximate distance oracle for planar graphs"
    - "fast and compact exact distance oracle for planar graphs"
    - "voronoi diagrams on planar graphs and computing the diameter in deterministic tilde o n 5 3 time"
    - "a faster distributed single source shortest paths algorithm"

Connected through hyperedge HE-2 (induced by source paper "a divide and conquer algorithm for two point l_1 shortest path queries in polygonal domains"):
  with members:
    - "l_1 shortest path queries in simple polygons"
    - "computing l1 shortest paths among polygonal obstacles in the plane"
    - "exact distance oracles for planar graphs"

Connected through hyperedge HE-3 (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"
    - "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"
    - "structured recursive separator decompositions for planar graphs in linear time"

Connected through hyperedge HE-4 (induced by source paper "exploiting hopsets improved distance oracles for graphs of constant highway dimension and beyond"):
  with members:
    - "linear size hopsets with small hopbound and distributed routing with low memory"
    - "fast and compact exact distance oracle for planar graphs"
    - "beyond highway dimension small distance labels using tree skeletons"
    - "algorithmic and hardness results for the hub labeling problem"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "hopsets with constant hopbound and applications to approximate shortest paths"
    - "sublinear space distance labeling using hubs"
    - "sublinear distance labeling"

Connected through hyperedge HE-5 (induced by source paper "the inverse voronoi problem in graphs"):
  with members:
    - "on the minimum consistent subset problem"
    - "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"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "near optimal sample compression for nearest neighbors"
    - "voronoi game on graphs"
    - "graph induced complex on point data"
    - "minimum weight triangulation is np hard"

Connected through hyperedge HE-6 (induced by source paper "reactive proximity data structures for graphs"):
  with members:
    - "dynamic geometric data structures via shallow cuttings"
    - "crossing patterns in nonplanar road networks"
    - "defining equitable geographic districts in road networks via stable matching"
    - "dynamic planar voronoi diagrams for general distance functions and their algorithmic applications"
    - "treetopes and their graphs"
    - "going off road transversal complexity in road networks"
    - "all maximal independent sets and dynamic dominance for sparse graphs"
    - "fast hierarchical clustering and other applications of dynamic closest pairs"

Connected through hyperedge HE-7 (induced by source paper "subquadratic algorithms for the diameter and the sum of pairwise distances in planar graphs"):
  with members:
    - "fast and compact exact distance oracle for planar graphs"
    - "voronoi diagrams on planar graphs and computing the diameter in deterministic tilde o n 5 3 time"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "faster shortest paths in dense distance graphs with applications"
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "multiple source shortest paths in embedded graphs"
    - "approximating the diameter of planar graphs in near linear time"
    - "linear space approximate distance oracles for planar bounded genus and minor free graphs"

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)