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: "conditional lower bounds for space time tradeoffs"
  Abstract: In recent years much effort has been concentrated towards achieving polynomial time lower bounds on algorithms for solving various well-known problems. A useful technique for showing such lower bounds is to prove them conditionally based on well-studied hardness assumptions such as 3SUM, APSP, SETH, etc. This line of research helps to obtain a better understanding of the complexity inside P.

Connected through hyperedge HE-1 (induced by source paper "data structures meet cryptography 3sum with preprocessing"):
  with members:
    - "the strong 3sum indexing conjecture is false"
    - "equivalence of systematic linear data structures and matrix rigidity"
    - "lower bounds for oblivious data structures"
    - "static data structure lower bounds imply rigidity"
    - "how hard is it to find honest witnesses"
    - "orthogonal vectors indexing"
    - "clustered integer 3sum via additive combinatorics"
    - "popular conjectures imply strong lower bounds for dynamic problems"

Connected through hyperedge HE-2 (induced by source paper "3sum with preprocessing algorithms lower bounds and cryptographic applications"):
  with members:
    - "encoding 3sum"
    - "static data structure lower bounds imply rigidity"
    - "near optimal linear decision trees for k sum and related problems"
    - "orthogonal vectors indexing"
    - "clustered integer 3sum via additive combinatorics"
    - "threesomes degenerates and love triangles"
    - "on hardness of jumbled indexing"
    - "higher lower bounds from the 3sum conjecture"

Connected through hyperedge HE-3 (induced by source paper "on the hardness of set disjointness and set intersection with bounded universe"):
  with members:
    - "how hard is it to find honest witnesses"
    - "data structure lower bounds for document indexing problems"
    - "dynamic set intersection"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "on hardness of jumbled indexing"
    - "higher lower bounds from the 3sum conjecture"
    - "approximate distance oracle with constant query time"
    - "exact weight subgraphs and the k sum conjecture"

Connected through hyperedge HE-4 (induced by source paper "the strong 3sum indexing conjecture is false"):
  with members:
    - "3sum with preprocessing algorithms lower bounds and cryptographic applications"
    - "how hard is it to find honest witnesses"
    - "dynamic set intersection"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "on hardness of jumbled indexing"
    - "higher lower bounds from the 3sum conjecture"

Connected through hyperedge HE-5 (induced by source paper "on the hardness of approximate and exact bichromatic maximum inner product"):
  with members:
    - "hardness of approximate nearest neighbor search"
    - "conditional lower bounds for all pairs max flow"
    - "distributed pcp theorems for hardness of approximation in p"
    - "on the parameterized complexity of approximating dominating set"
    - "improved rectangular matrix multiplication using powers of the coppersmith winograd tensor"
    - "on the complexity of closest pair via polar pair of point sets"
    - "a framework for similarity search with space time tradeoffs using locality sensitive filtering"
    - "on the complexity of inner product similarity join"

Connected through hyperedge HE-6 (induced by source paper "fine grained complexity meets ip pspace"):
  with members:
    - "on problems equivalent to min convolution"
    - "hardness of approximate nearest neighbor search"
    - "on the hardness of approximate and exact bichromatic maximum inner product"
    - "tighter connections between formula sat and shaving logs"
    - "conditional lower bounds for all pairs max flow"
    - "conditional hardness for sensitivity problems"
    - "on the parameterized complexity of approximating dominating set"
    - "on the complexity of closest pair via polar pair of point sets"

Connected through hyperedge HE-7 (induced by source paper "nearly optimal separation between partially and fully retroactive data structures"):
  with members:
    - "conditional hardness for sensitivity problems"
    - "popular conjectures as a barrier for dynamic planar graph algorithms"
    - "threesomes degenerates and love triangles"
    - "popular conjectures imply strong lower bounds for dynamic problems"
    - "higher lower bounds from the 3sum conjecture"
    - "fully retroactive approximate range and nearest neighbor searching"
    - "searching in dynamic catalogs on a tree"

Connected through hyperedge HE-8 (induced by source paper "compressed representations of conjunctive query results"):
  with members:
    - "size bounds and query plans for relational joins"
    - "answering conjunctive queries under updates"
    - "extracting and analyzing hidden graphs from relational databases"
    - "data structure lower bounds for document indexing problems"
    - "aggregation and ordering in factorised databases"
    - "structural tractability of counting of solutions to conjunctive queries"
    - "skew strikes back new developments in the theory of join algorithms"
    - "fdb a query engine for factorised relational databases"

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)