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: "algorithms for routing an unmanned aerial vehicle in the presence of refueling depots"
  Abstract: We consider a single Unmanned Aerial Vehicle (UAV) routing problem where there are multiple depots and the vehicle is allowed to refuel at any depot. The objective of the problem is to find a path for the UAV such that each target is visited at least once by the vehicle, the fuel constraint is never violated along the path for the UAV, and the total fuel required by the UAV is a minimum. We develop an approximation algorithm for the problem, and propose fast construction and improvement heuristics to solve the same. Computational results show that solutions whose costs are on an average within 1.4% of the optimum can be obtained relatively fast for the problem involving 5 depots and 25 targets.

Connected through hyperedge HE-1 (induced by source paper "shipper cooperation in stochastic drone delivery a dynamic bayesian game approach"):
  with members:
    - "joint ground and aerial package delivery services a stochastic optimization approach"
    - "coalitional games in partition form for joint spectrum sensing and access in cognitive radio networks"

Connected through hyperedge HE-2 (induced by source paper "potential data link candidates for civilian unmanned aircraft systems a survey"):
  with members:
    - "analysis of aeromacs data link for unmanned aircraft vehicles"
    - "understanding uav cellular communications from existing networks to massive mimo"
    - "beyond 5g with uavs foundations of a 3d wireless cellular network"
    - "real time optimal resource allocation for embedded uav communication systems"
    - "robust resource allocation for uav systems with uav jittering and user location uncertainty"
    - "integrating small satellite communication in an autonomous vehicle network a case for oceanography"
    - "a tutorial on uavs for wireless networks applications challenges and open problems"
    - "spatial configuration of agile wireless networks with drone bss and user in the loop"

Connected through hyperedge HE-3 (induced by source paper "an approximation algorithm for a task allocation sequencing and scheduling problem involving a human robot team"):
  with members:
    - "agricultural robotics the future of robotic agriculture"
    - "generalized multiple depot traveling salesmen problem polyhedral study and exact algorithm"
    - "julia a fresh approach to numerical computing"

Connected through hyperedge HE-4 (induced by source paper "path planning for multiple heterogeneous unmanned vehicles with uncertain service times"):
  with members:
    - "analysis of mixed integer linear programming formulations for a fuel constrained multiple vehicle routing problem"
    - "formulations and algorithms for the multiple depot fuel constrained multiple vehicle routing problem"
    - "generalized multiple depot traveling salesmen problem polyhedral study and exact algorithm"

Connected through hyperedge HE-5 (induced by source paper "analysis of mixed integer linear programming formulations for a fuel constrained multiple vehicle routing problem"):
  with members:
    - "formulations and algorithms for the multiple depot fuel constrained multiple vehicle routing problem"
    - "generalized multiple depot traveling salesmen problem polyhedral study and exact algorithm"

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)