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: "improved upper bounds for pairing heaps"
  Abstract: Pairing heaps are shown to have constant amortized time Insert and Meld, thus showing that pairing heaps have the same amortized runtimes as Fibonacci heaps for all operations but Decrease-key.

Connected through hyperedge HE-1 (induced by source paper "smooth heaps and a dual view of self adjusting data structures"):
  with members:
    - "weighted dynamic finger in binary search trees"
    - "improved bounds for multipass pairing heaps and path balanced binary search trees"
    - "pairing heaps the forward variant"
    - "the landscape of bounds for binary search trees"
    - "pattern avoiding access in binary search trees"
    - "greedy is an almost optimal deque"
    - "a back to basics empirical study of priority queues"
    - "a tight lower bound for decrease key in the pure heap model"

Connected through hyperedge HE-2 (induced by source paper "improved bounds for multipass pairing heaps and path balanced binary search trees"):
  with members:
    - "in pursuit of the dynamic optimality conjecture"

Connected through hyperedge HE-3 (induced by source paper "pairing heaps the forward variant"):
  with members:
    - "a tight lower bound for decrease key in the pure heap model"
    - "in pursuit of the dynamic optimality conjecture"

Connected through hyperedge HE-4 (induced by source paper "a linear potential function for pairing heaps"):
  with members:
    - "a back to basics empirical study of priority queues"
    - "pairing heaps with costless meld"

Connected through hyperedge HE-5 (induced by source paper "a tight lower bound for decrease key in the pure heap model"):
  with members:
    - "pairing heaps with costless meld"
    - "the violation heap a relaxed fibonacci like heap"

Connected through hyperedge HE-6 (induced by source paper "a back to basics empirical study of priority queues"):
  with members:
    - "the violation heap a relaxed fibonacci like heap"

Connected through hyperedge HE-7 (induced by source paper "combining binary search trees"):
  with members:
    - "the power and limitations of static binary search trees with lazy finger"
    - "de amortizing binary search trees"
    - "layered working set trees"

Connected through hyperedge HE-8 (induced by source paper "why some heaps support constant amortized time decrease key operations and others do not"):
  with members:
    - "the violation heap a relaxed fibonacci like heap"

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)