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: "shortest paths in planar graphs with real lengths in o n log 2n log log n time"
  Abstract: Given an $n$-vertex planar directed graph with real edge lengths and with no negative cycles, we show how to compute single-source shortest path distances in the graph in $O(n\log^2n/\log\log n)$ time with O(n) space. This is an improvement of a recent time bound of $O(n\log^2n)$ by Klein et al.

Connected through hyperedge HE-1 (induced by source paper "level planar drawings with few slopes"):
  with members:
    - "drawing k linear metro maps"
    - "experimental analysis of the accessibility of drawings with few segments"
    - "simultaneous orthogonal planarity"
    - "beyond level planarity"
    - "outerplanar graph drawings with few slopes"
    - "simultaneous embedding of planar graphs"
    - "multiple source multiple sink maximum flow in directed planar graphs in near linear time"

Connected through hyperedge HE-2 (induced by source paper "min cost flow in unit capacity planar graphs"):
  with members:
    - "a faster algorithm for minimum cost bipartite matching in minor free graphs"
    - "nc algorithms for weighted planar perfect matching and related problems"
    - "improved bounds for shortest paths in dense distance graphs"
    - "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"
    - "faster approximate lossy generalized flow via interior point algorithms"

Connected through hyperedge HE-3 (induced by source paper "drawing hv restricted planar graphs"):
  with members:
    - "multiple source multiple sink maximum flow in directed planar graphs in near linear time"

Connected through hyperedge HE-4 (induced by source paper "holiest minimum cost paths and flows in surface graphs"):
  with members:
    - "minimum cycle and homology bases of surface embedded graphs"
    - "minimum cut of directed planar graphs in o nloglogn time"
    - "faster parametric shortest path and minimum balance algorithms"
    - "all pairs minimum cuts in near linear time for surface embedded graphs"
    - "computing the girth of a planar graph in linear time"
    - "lattices and maximum flow algorithms in planar graphs"
    - "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-5 (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-6 (induced by source paper "exact distance oracles for planar graphs with failing vertices"):
  with members:
    - "almost optimal distance oracles 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"
    - "improved bounds for shortest paths in dense distance graphs"
    - "popular conjectures as a barrier for dynamic planar graph algorithms"
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "multiple source shortest paths in embedded graphs"
    - "exact distance oracles for planar graphs"

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"
    - "better tradeoffs for exact distance oracles in planar graphs"
    - "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"

Connected through hyperedge HE-8 (induced by source paper "minimum cuts and shortest cycles in directed planar graphs via noncrossing shortest paths"):
  with members:
    - "minimum cut of directed planar graphs in o nloglogn time"
    - "submatrix maximum queries in monge matrices are equivalent to predecessor search"
    - "computing the girth of a planar graph in linear time"
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "algorithmic applications of baur strassen s theorem shortest cycles diameter and matchings"
    - "shortest non trivial cycles in directed and undirected surface graphs"
    - "optimally cutting a surface into a disk"
    - "minimum cuts in near linear time"

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.DM(Discrete Mathematics)