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: "minimum common string partition parameterized by partition size is fixed parameter tractable"
  Abstract: The NP-hard Minimum Common String Partition problem asks whether two strings $x$ and $y$ can each be partitioned into at most $k$ substrings, called blocks, such that both partitions use exactly the same blocks in a different order. We present the first fixed-parameter algorithm for Minimum Common String Partition using only parameter $k$.

Connected through hyperedge HE-1 (induced by source paper "approximating weighted duo preservation in comparative genomics"):
  with members:
    - "a family of approximation algorithms for the maximum duo preservation string mapping problem"
    - "parameterized tractability of the maximum duo preservation string mapping problem"
    - "a fixed parameter algorithm for minimum common string partition with few duplications"
    - "approximation algorithms for maximum independent set of pseudo disks"

Connected through hyperedge HE-2 (induced by source paper "an integer programming formulation of the minimum common string partition problem"):
  with members:
    - "mathematical programming strategies for solving the minimum common string partition problem"
    - "solving the minimum common string partition problem with the help of ants"
    - "a fixed parameter algorithm for minimum common string partition with few duplications"

Connected through hyperedge HE-3 (induced by source paper "parameterized tractability of the maximum duo preservation string mapping problem"):
  with members:
    - "a fixed parameter algorithm for minimum common string partition with few duplications"
    - "variants of constrained longest common subsequence"

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)