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: "the complexity of clickomania"
  Abstract: We study a popular puzzle game known variously as Clickomania and Same Game. Basically, a rectangular grid of blocks is initially colored with some number of colors, and the player repeatedly removes a chosen connected monochromatic group of at least two square blocks, and any blocks above it fall down. We show that one-column puzzles can be solved, i.e., the maximum possible number of blocks can be removed, in linear time for two colors, and in polynomial time for an arbitrary number of colors. On the other hand, deciding whether a puzzle is solvable (all blocks can be removed) is NP-complete for two columns and five colors, or five columns and three colors.

Connected through hyperedge HE-1 (induced by source paper "the computational complexity of fire emblem series and similar tactical role playing games"):
  with members:
    - "computational complexity of games and puzzles"
    - "trainyard is np hard"
    - "on planar variants of the monotone satisfiability problem with bounded variable appearances"
    - "the computational complexity of portal and other 3d video games"
    - "candy crush is np hard"
    - "classic nintendo games are computationally hard"
    - "lemmings is pspace complete"
    - "the complexity of the puzzles of final fantasy xiii 2"

Connected through hyperedge HE-2 (induced by source paper "the complexity of the puzzles of final fantasy xiii 2"):
  with members:
    - "gaming is a hard job but someone has to do it"
    - "the complexity of flood filling games"
    - "tetris is hard even to approximate"

Connected through hyperedge HE-3 (induced by source paper "an algorithmic analysis of the honey bee game"):
  with members:
    - "the complexity of flood filling games"
    - "playing games with algorithms algorithmic combinatorial game theory"

Connected through hyperedge HE-4 (induced by source paper "phutball is pspace hard"):
  with members:
    - "playing games with algorithms algorithmic combinatorial game theory"
    - "phutball endgames are hard"

Connected through hyperedge HE-5 (induced by source paper "the complexity of flood filling games"):
  with members:
    - "an algorithmic analysis of the honey bee game"
    - "tetris is hard even to approximate"

Connected through hyperedge HE-6 (induced by source paper "playing games with algorithms algorithmic combinatorial game theory"):
  with members:
    - "pspace completeness of sliding block puzzles and other problems through the nondeterministic constraint logic model of computation"
    - "coin moving puzzles"
    - "pushpush and push 1 are np hard in 2d"
    - "pushpush is np hard in 2d"

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.CC(Computational Complexity)