Advances in Graph Algorithms and Substructure Detection

The research area is witnessing significant advancements in algorithmic efficiency and problem-solving approaches across various graph-related challenges. Key developments include the exploration of fixed-parameter tractable (FPT) algorithms for dense graph structures, with a particular focus on cluster modulators and their properties. Innovations in detecting and counting critical substructures like bicliques and butterflies in bipartite graphs, especially under streaming conditions with duplicate edges, are also notable. Additionally, there is a growing interest in understanding the complexity of graph editing problems on specific classes of graphs, such as cographs and their subclasses, which has implications for computational biology and social network analysis. Parallel and efficient algorithms for heavy hitter detection in data streams are addressing the need for scalable solutions in real-time data processing. Lastly, the extension of polynomial-time tractability to larger classes of graphs, such as $P_7$-free graphs with bounded clique number, underscores a broader trend towards broadening the applicability of efficient algorithms in graph theory.

Noteworthy papers include one on deterministic even-cycle detection in broadcast CONGEST, which introduces a new combinatorial result, and another on counting butterflies in streaming bipartite graphs with duplicate edges, offering a novel method that significantly improves memory efficiency and accuracy.

Sources

Fast FPT Algorithms for Grundy Number on Dense Graphs

New results for the detection of bicliques

Deterministic Even-Cycle Detection in Broadcast CONGEST

Counting Butterflies over Streaming Bipartite Graphs with Duplicate Edges

Cluster Editing on Cographs and Related Classes

Cuckoo Heavy Keeper and the balancing act of maintaining heavy-hitters in stream processing

Sparse induced subgraphs in $P_7$-free graphs of bounded clique number

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