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: "additive spanners a simple construction"
  Abstract: We consider additive spanners of unweighted undirected graphs. Let $G$ be a graph and $H$ a subgraph of $G$. The most na\"ive way to construct an additive $k$-spanner of $G$ is the following: As long as $H$ is not an additive $k$-spanner repeat: Find a pair $(u,v) \in H$ that violates the spanner-condition and a shortest path from $u$ to $v$ in $G$. Add the edges of this path to $H$. #R##N#We show that, with a very simple initial graph $H$, this na\"ive method gives additive $6$- and $2$-spanners of sizes matching the best known upper bounds. For additive $2$-spanners we start with $H=\emptyset$ and end with $O(n^{3/2})$ edges in the spanner. For additive $6$-spanners we start with $H$ containing $\lfloor n^{1/3} \rfloor$ arbitrary edges incident to each node and end with a spanner of size $O(n^{4/3})$.

Connected through hyperedge HE-1 (induced by source paper "weighted additive spanners"):
  with members:
    - "some general structure for extremal sparsification problems"
    - "almost shortest paths and pram distance oracles in weighted graphs"
    - "lower bounds on sparse spanners emulators and diameter reducing shortcuts"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "linear size distance preservers"
    - "better distance preservers and additive spanners"
    - "the 4 3 additive spanner exponent is tight"
    - "on pairwise spanners"

Connected through hyperedge HE-2 (induced by source paper "some general structure for extremal sparsification problems"):
  with members:
    - "improved guarantees for vertex sparsification in planar graphs"
    - "reachability preservers new extremal bounds and approximation algorithms"
    - "linear size distance preservers"
    - "on pairwise spanners"

Connected through hyperedge HE-3 (induced by source paper "graph spanners a tutorial review"):
  with members:
    - "near additive spanners and near exact hopsets a unified view"
    - "some general structure for extremal sparsification problems"
    - "weighted additive spanners"
    - "near additive spanners in low polynomial deterministic congest time"
    - "multi level graph sketches via single level solvers"
    - "almost shortest paths and pram distance oracles in weighted graphs"
    - "an fpt algorithm for minimum additive spanner problem"
    - "distributed construction of light networks"

Connected through hyperedge HE-4 (induced by source paper "an fpt algorithm for minimum additive spanner problem"):
  with members:
    - "efficient algorithms for constructing very sparse spanners and emulators"
    - "the 4 3 additive spanner exponent is tight"

Connected through hyperedge HE-5 (induced by source paper "lower bounds on sparse spanners emulators and diameter reducing shortcuts"):
  with members:
    - "thorup zwick emulators are universally optimal hopsets"
    - "nearly work efficient parallel algorithm for digraph reachability"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "linear size distance preservers"
    - "very sparse additive spanners and emulators"
    - "better distance preservers and additive spanners"
    - "the 4 3 additive spanner exponent is tight"

Connected through hyperedge HE-6 (induced by source paper "thorup zwick emulators are universally optimal hopsets"):
  with members:
    - "linear size hopsets with small hopbound and distributed routing with low memory"
    - "a hierarchy of lower bounds for sublinear additive spanners"
    - "hopsets with constant hopbound and applications to approximate shortest paths"
    - "a deterministic almost tight distributed algorithm for approximating single source shortest paths"
    - "decremental single source shortest paths on undirected graphs in near linear total update time"
    - "improved parallel algorithms for spanners and hopsets"

Connected through hyperedge HE-7 (induced by source paper "distributed construction of purely additive spanners"):
  with members:
    - "better distance preservers and additive spanners"
    - "the 4 3 additive spanner exponent is tight"
    - "approximation of distances and shortest paths in the broadcast congest clique"
    - "bypassing erd h o s girth conjecture hybrid stretch and sourcewise spanners"
    - "distributed minimum cut approximation"
    - "distributed connectivity decomposition"
    - "on pairwise spanners"
    - "global computation in a poorly connected world fast rumor spreading with no dependence on conductance"

Connected through hyperedge HE-8 (induced by source paper "a hierarchy of lower bounds for sublinear additive spanners"):
  with members:
    - "hopsets with constant hopbound and applications to approximate shortest paths"
    - "a linear size logarithmic stretch path reporting distance oracle for general graphs"
    - "very sparse additive spanners and emulators"
    - "better distance preservers and additive spanners"
    - "the 4 3 additive spanner exponent is tight"
    - "bypassing erd h o s girth conjecture hybrid stretch and sourcewise spanners"
    - "on pairwise spanners"
    - "on the hardness of distance oracle for sparse graph"

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)