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: "there is no 16 clue sudoku solving the sudoku minimum number of clues problem"
  Abstract: We apply our new hitting set enumeration algorithm to solve the sudoku minimum number of clues problem, which is the following question: What is the smallest number of clues (givens) that a sudoku puzzle may have? It was conjectured that the answer is 17. We have performed an exhaustive search for a 16-clue sudoku puzzle, and we did not find one, thereby proving that the answer is inde ed 17. This article describes our method and the actual search. The hitting set problem is computationally hard; it is one of Karp’s twenty-one classic NP-complete problems. We have designed a new algorithm that allows us to efficiently enumerate hitting sets of a suitable size. Hit ting set problems have applications in many areas of science, such as bioinformatics and software testing.

Connected through hyperedge HE-1 (induced by source paper "problem solving at the edge of chaos entropy puzzles and the sudoku freezing transition"):
  with members:
    - "combining the k cnf and xor phase transitions"
    - "computational red teaming in a sudoku solving context neural network based skill representation and acquisition"
    - "the backtracking survey propagation algorithm for solving random k sat problems"
    - "the condensation phase transition in random graph coloring"
    - "difficulty rating of sudoku puzzles an overview and evaluation"
    - "aspects of statistical physics in computational complexity"
    - "on the role of working memory in trading off skills and situation awareness in sudoku"
    - "view based propagator derivation"

Connected through hyperedge HE-2 (induced by source paper "on a generalization of eight blocks to madness"):
  with members:
    - "candy crush is np hard"
    - "classic nintendo games are computationally hard"
    - "tetris is hard even to approximate"

Connected through hyperedge HE-3 (induced by source paper "redundant sudoku rules"):
  with members:
    - "d flat declarative problem solving using tree decompositions and answer set programming"
    - "compiling finite domain constraints to sat with bee"

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)