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: "evacuating robots from a disk using face to face communication"
  Abstract: Assume that two robots are located at the centre of a unit disk. Their goal is to evacuate from the disk through an exit at an unknown location on the boundary of the disk. At any time the robots can move anywhere they choose on the disk, independently of each other, with maximum speed $1$. The robots can cooperate by exchanging information whenever they meet. We study algorithms for the two robots to minimize the evacuation time: the time when both robots reach the exit. #R##N#In [CGGKMP14] the authors gave an algorithm defining trajectories for the two robots yielding evacuation time at most $5.740$ and also proved that any algorithm has evacuation time at least $3+ \frac{\pi}{4} + \sqrt{2} \approx 5.199$. We improve both the upper and lower bounds on the evacuation time of a unit disk. Namely, we present a new non-trivial algorithm whose evacuation time is at most $5.628$ and show that any algorithm has evacuation time at least $3+ \frac{\pi}{6} + \sqrt{3} \approx 5.255$. To achieve the upper bound, we designed an algorithm which non-intuitively proposes a forced meeting between the two robots, even if the exit has not been found by either of them.

Connected through hyperedge HE-1 (induced by source paper "energy consumption of group search on a line"):
  with members:
    - "average case worst case tradeoffs for evacuating 2 robots from the disk in the face to face model"
    - "god save the queen"
    - "priority evacuation from a disk using mobile robots"
    - "linear search with terrain dependent speeds"
    - "search on a line by byzantine robots"
    - "fast two robot disk evacuation with wireless communication"
    - "search and fetch with 2 robots on a disk wireless and face to face communication models"
    - "online searching with turn cost"

Connected through hyperedge HE-2 (induced by source paper "time energy tradeoffs for evacuation by two robots in the wireless model"):
  with members:
    - "average case worst case tradeoffs for evacuating 2 robots from the disk in the face to face model"
    - "god save the queen"
    - "priority evacuation from a disk using mobile robots"
    - "linear search with terrain dependent speeds"
    - "search on a line by byzantine robots"
    - "search and fetch with 2 robots on a disk wireless and face to face communication models"
    - "online searching with turn cost"

Connected through hyperedge HE-3 (induced by source paper "evacuation of equilateral triangles by mobile agents of limited communication range"):
  with members:
    - "evacuation of rectilinear polygons"
    - "online searching with turn cost"

Connected through hyperedge HE-4 (induced by source paper "evacuating equilateral triangles and squares in the face to face model"):
  with members:
    - "god save the queen"
    - "priority evacuation from a disk using mobile robots"
    - "trade offs between selection complexity and performance when searching the plane without communication"
    - "collaborative search on the plane without communication"

Connected through hyperedge HE-5 (induced by source paper "linear search with terrain dependent speeds"):
  with members:
    - "revisiting the problem of searching on a line"
    - "time varying graphs and dynamic networks"
    - "online searching with turn cost"

Connected through hyperedge HE-6 (induced by source paper "exploring graphs with time constraints by unreliable collections of mobile robots"):
  with members:
    - "time varying graphs and dynamic networks"
    - "online searching with turn cost"

Connected through hyperedge HE-7 (induced by source paper "search and fetch with 2 robots on a disk wireless and face to face communication models"):
  with members:
    - "fast two robot disk evacuation with wireless communication"
    - "evacuation of rectilinear polygons"
    - "online searching with turn cost"
    - "optimal constructions of hybrid algorithms"

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)