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: "construction of an np problem with an exponential lower bound"
  Abstract: In this paper we present a Hashed-Path Traveling Salesperson Problem (HPTSP), a new type of problem which has the interesting property of having no polynomial time solutions. Next we show that HPTSP is in the class NP by demonstrating that local information about sub-routes is insufficient to compute the complete value of each route. As a consequence, via Ladner's theorem, we show that the class NPI is non-empty.

Connected through hyperedge HE-1 (induced by source paper "the singularity may be near"):
  with members:
    - "the singularity may never be near"
    - "from seed ai to technological singularity via recursively self improving software"

Connected through hyperedge HE-2 (induced by source paper "from seed ai to technological singularity via recursively self improving software"):
  with members:
    - "the universe of minds"
    - "bounded recursive self improvement"
    - "self improving algorithms"
    - "goedel machines self referential universal problem solvers making provably optimal self improvements"
    - "definition and complexity of some basic metareasoning problems"
    - "optimal ordered problem solver"

Connected through hyperedge HE-3 (induced by source paper "the universe of minds"):
  with members:
    - "efficiency theory a unifying theory for information computation and intelligence"
    - "universal intelligence a definition of machine intelligence"
    - "is there an elegant universal theory of prediction"

Connected through hyperedge HE-4 (induced by source paper "efficiency theory a unifying theory for information computation and intelligence"):
  with members:
    - "why philosophers should care about computational complexity"
    - "the p versus np problem"
    - "universal intelligence a definition of machine intelligence"

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)