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: "computing the 2 blocks of directed graphs"
  Abstract: Let $G$ be a directed graph. A \textit{$2$-directed block} in $G$ is a maximal vertex set $C^{2d}\subseteq V$ with $|C^{2d}|\geq 2$ such that for each pair of distinct vertices $x,y \in C^{2d}$, there exist two vertex-disjoint paths from $x$ to $y$ and two vertex-disjoint paths from $y$ to $x$ in $G$. In contrast to the $2$-vertex-connected components of $G$, the subgraphs induced by the $2$-directed blocks may consist of few or no edges. In this paper we present two algorithms for computing the $2$-directed blocks of $G$ in $O(\min\lbrace m,(t_{sap}+t_{sb})n\rbrace n)$ time, where $t_{sap}$ is the number of the strong articulation points of $G$ and $t_{sb}$ is the number of the strong bridges of $G$. Furthermore, we study two related concepts: the $2$-strong blocks and the $2$-edge blocks of $G$. We give two algorithms for computing the $2$-strong blocks of $G$ in $O( \min \lbrace m,t_{sap} n\rbrace n)$ time and we show that the $2$-edge blocks of $G$ can be computed in $O(\min \lbrace m, t_{sb} n \rbrace n)$ time. In this paper we also study some optimization problems related to the strong articulation points and the $2$-blocks of a directed graph. Given a strongly connected graph $G=(V,E)$, find a minimum cardinality set $E^{*}\subseteq E$ such that $G^{*}=(V,E^{*})$ is strongly connected and the strong articulation points of $G$ coincide with the strong articulation points of $G^{*}$. This problem is called minimum strongly connected spanning subgraph with the same strong articulation points. We show that there is a linear time $17/3$ approximation algorithm for this NP-hard problem. We also consider the problem of finding a minimum strongly connected spanning subgraph with the same $2$-blocks in a strongly connected graph $G$. We present approximation algorithms for three versions of this problem, depending on the type of $2$-blocks.

Connected through hyperedge HE-1 (induced by source paper "twinless articulation points and some related problems"):
  with members:
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "2 edge connectivity in directed graphs"
    - "on computing the 2 vertex connected components of directed graphs"
    - "a simple test on 2 vertex and 2 edge connectivity"
    - "approximating the minimum equivalent digraph"

Connected through hyperedge HE-2 (induced by source paper "2 edge twinless blocks"):
  with members:
    - "twinless articulation points and some related problems"
    - "computing 2 twinless blocks"
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "2 edge connectivity in directed graphs"
    - "on computing the 2 vertex connected components of directed graphs"

Connected through hyperedge HE-3 (induced by source paper "computing 2 twinless blocks"):
  with members:
    - "twinless articulation points and some related problems"
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "2 edge connectivity in directed graphs"
    - "on computing the 2 vertex connected components of directed graphs"
    - "a simple test on 2 vertex and 2 edge connectivity"

Connected through hyperedge HE-4 (induced by source paper "on low high orders of directed graphs incremental algorithms and applications"):
  with members:
    - "incremental 2 edge connectivity in directed graphs"
    - "an experimental study of dynamic dominators"
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "2 edge connectivity in directed graphs"
    - "on computing the 2 vertex connected components of directed graphs"
    - "finding dominators via disjoint set union"
    - "a new approach to incremental cycle detection and related problems"

Connected through hyperedge HE-5 (induced by source paper "incremental 2 edge connectivity in directed graphs"):
  with members:
    - "an experimental study of dynamic dominators"
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "2 edge connectivity in directed graphs"
    - "on computing the 2 vertex connected components of directed graphs"
    - "finding dominators via disjoint set union"
    - "a new approach to incremental cycle detection and related problems"
    - "incremental cycle detection topological ordering and strong component maintenance"

Connected through hyperedge HE-6 (induced by source paper "an experimental study of dynamic dominators"):
  with members:
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "2 edge connectivity in directed graphs"
    - "on computing the 2 vertex connected components of directed graphs"
    - "finding dominators via disjoint set union"
    - "influence maximization in continuous time diffusion networks"

Connected through hyperedge HE-7 (induced by source paper "approximating the smallest spanning subgraph for 2 edge connectivity in directed graphs"):
  with members:
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "2 edge connectivity in directed graphs"
    - "dominator tree certification and independent spanning trees"
    - "a rounding by sampling approach to the minimum size k arc connected subgraph problem"

Connected through hyperedge HE-8 (induced by source paper "strong connectivity in directed graphs under failures with application"):
  with members:
    - "finding 2 edge and 2 vertex strongly connected components in quadratic time"
    - "approximating the smallest spanning subgraph for 2 edge connectivity in directed graphs"
    - "2 edge connectivity in directed graphs"
    - "finding dominators via disjoint set union"

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)