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: "online steiner tree with deletions"
  Abstract: In the online Steiner tree problem, the input is a set of vertices that appear one-by-one, and we have to maintain a Steiner tree on the current set of vertices. The cost of the tree is the total length of edges in the tree, and we want this cost to be close to the cost of the optimal Steiner tree at all points in time. If we are allowed to only add edges, a tight bound of $\Theta(\log n)$ on the competitiveness is known. Recently it was shown that if we can add one new edge and make one edge swap upon every vertex arrival, we can maintain a constant-competitive tree online. #R##N#But what if the set of vertices sees both additions and deletions? Again, we would like to obtain a low-cost Steiner tree with as few edge changes as possible. The original paper of Imase and Waxman had also considered this model, and it gave a greedy algorithm that maintained a constant-competitive tree online, and made at most $O(n^{3/2})$ edge changes for the first $n$ requests. In this paper give the following two results. #R##N#Our first result is an online algorithm that maintains a Steiner tree only under deletions: we start off with a set of vertices, and at each time one of the vertices is removed from this set: our Steiner tree no longer has to span this vertex. We give an algorithm that changes only a constant number of edges upon each request, and maintains a constant-competitive tree at all times. Our algorithm uses the primal-dual framework and a global charging argument to carefully make these constant number of changes. #R##N#We then study the natural greedy algorithm proposed by Imase and Waxman that maintains a constant-competitive Steiner tree in the fully-dynamic model (where each request either adds or deletes a vertex). Our second result shows that this algorithm makes only a constant number of changes per request in an amortized sense.

Connected through hyperedge HE-1 (induced by source paper "online maximum matching with recourse"):
  with members:
    - "relaxing the irrevocability requirement for online graph algorithms"
    - "online bipartite matching with amortized o log 2 n replacements"
    - "the power of deferral maintaining a constant competitive steiner tree online"
    - "improved bounds for online preemptive matching"
    - "buyback problem approximate matroid intersection with cancellation costs"

Connected through hyperedge HE-2 (induced by source paper "maintaining perfect matchings at low cost"):
  with members:
    - "optimal analysis of an online algorithm for the bipartite matching problem on a line"
    - "the power of deferral maintaining a constant competitive steiner tree online"

Connected through hyperedge HE-3 (induced by source paper "online bipartite matching with amortized o log 2 n replacements"):
  with members:
    - "the shortest augmenting paths for online matchings on trees"
    - "online and dynamic algorithms for set cover"
    - "the power of deferral maintaining a constant competitive steiner tree online"
    - "navigating central path with electrical flows from flows to matchings and back"
    - "the power of dynamic distance oracles efficient dynamic algorithms for the steiner tree"
    - "better bounds for matchings in the streaming model"

Connected through hyperedge HE-4 (induced by source paper "relaxing the irrevocability requirement for online graph algorithms"):
  with members:
    - "online dominating set"
    - "advice complexity of the online induced subgraph problem"
    - "improved bounds for online preemptive matching"
    - "improved approximation guarantees for weighted matching in the semi streaming model"

Connected through hyperedge HE-5 (induced by source paper "a local search algorithm for steiner forest"):
  with members:
    - "local search yields a ptas for k means in doubling metrics"
    - "simple ptas s for families of graphs excluding a minor"
    - "local search based approximation algorithms for mobile facility location problems"

Connected through hyperedge HE-6 (induced by source paper "online and dynamic algorithms for set cover"):
  with members:
    - "deterministic fully dynamic approximate vertex cover and fractional matching in o 1 amortized update time"
    - "fully dynamic maximal matching in constant update time"
    - "new deterministic approximation algorithms for fully dynamic matching"
    - "design of dynamic algorithms via primal dual method"
    - "unifying and strengthening hardness for dynamic problems via the online matrix vector multiplication conjecture"
    - "fully dynamic matching in bipartite graphs"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "deterministic fully dynamic data structures for vertex cover and matching"

Connected through hyperedge HE-7 (induced by source paper "dynamic steiner tree and subgraph tsp"):
  with members:
    - "structured recursive separator decompositions for planar graphs in linear time"
    - "improved distance oracles and spanners for vertex labeled graphs"
    - "min st cut oracle for planar graphs with near linear preprocessing time"
    - "fast approximation in subspaces by doubling metric decomposition"
    - "dynamic connectivity connecting to networks and geometry"
    - "maintaining information in fully dynamic trees with top trees"

Connected through hyperedge HE-8 (induced by source paper "the power of dynamic distance oracles efficient dynamic algorithms for the steiner tree"):
  with members:
    - "the power of deferral maintaining a constant competitive steiner tree online"
    - "improved distance oracles and spanners for vertex labeled graphs"
    - "fast approximation in subspaces by doubling metric decomposition"

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)