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 "on conflict free chromatic guarding of simple polygons"):
  Abstract: We study the problem of colouring the vertices of a polygon, such that every viewer can see a unique colour. The goal is to minimize the number of colours used. This is also known as the conflict-free chromatic guarding problem with vertex guards (which is quite different from point guards considered in some other papers). We study the problem in two scenarios of a set of viewers. In the first one, we assume that the viewers are all points of the polygon. We efficiently solve the related problem of minimizing the number of guards and approximate (up to only an additive error) the number of colours in the special case of funnels. We also give an upper bound of O(log^2n) colours on weak-visibility polygons which generalizes to all simple polygons. In the second scenario, we assume that the viewers are only the vertices of the polygon. We show a lower bound of 3 colours in the general case of simple polygons and conjecture that this is tight. We also prove that already deciding whether 1 or 2 colours are enough is NP-complete.

Includes members:
  Member "a ptas for vertex guarding weakly visible polygons an extended abstract":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "the parameterized complexity of guarding almost convex polygons")
  Member "an approximation algorithm for the art gallery problem":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "the parameterized complexity of guarding almost convex polygons")
  Member "approximability of guarding weak visibility polygons":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "the parameterized complexity of guarding almost convex polygons")
  Member "improved approximation for guarding simple galleries from the perimeter":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "the parameterized complexity of guarding almost convex polygons")

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.CG(Computational Geometry)