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fix: use a queue for SPFA #893
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Looks great, thank you so much 👍 Would you mind rebasing and moving the test into |
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Thanks for the PR! I forgot that the benchmark creates a negative cycle, that explains everything :) |
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## 🤖 New release * `petgraph`: 0.8.2 -> 0.8.3 (✓ API compatible changes) <details><summary><i><b>Changelog</b></i></summary><p> <blockquote> ## [0.8.3](https://github.com/petgraph/petgraph/compare/petgraph@v0.8.2...petgraph@v0.8.3) - 2025-09-28 ### Bug Fixes - Infinite `subgraph_isomorphisms_iter` for empty isomorphisms ([#780](#780)) - Algos don't work on `UndirectedAdaptor` ([#870](#870)) ([#871](#871)) - use a queue for SPFA ([#893](#893)) - `StableGraph::reverse` breaks free lists ([#890](#890)) ### Documentation - Fix examples link in README and unify typesetting of one word ([#823](#823)) - Add link to multigraph definition to isomorphism algos ([#824](#824)) - Fix auxiliary space (and time) complexity of bron-kerbosch ([#825](#825)) - Fix Typo in Operator Module Documentation ([#831](#831)) - Sync the crate feature flags in the README and docs ([#832](#832)) - Remove all \[Generic\] tags from algo docstrings ([#835](#835)) - Fix typos in comments ([#836](#836)) - Revamp CONTRIBUTING.md ([#833](#833)) - Update `GraphMap` link in README ([#857](#857)) - Add doc comment for `Dot::with_attr_getters` ([#850](#850)) - Specify iteration order for neighbors and edges and their variants ([#790](#790)) - Collection of Doc fixes ([#856](#856)) ### New Features - Add `into_nodes_edges_iters` to `StableGraph` ([#841](#841)) - Add methods to reserve & shrink `StableGraph` capacity ([#846](#846)) - Add Dinic's Maximum Flow Algorithm ([#739](#739)) - make Csr::from_sorted_edges generic over edge type and properly increase edge_count in Csr::from_sorted_edges ([#861](#861)) - Add `map_owned` and `filter_map_owned` for `Graph` and `StableGraph` ([#863](#863)) - Add dijkstra::with_dynamic_goal ([#855](#855)) - Fix self-loop bug in all_simple_paths and enable multiple targets ([#865](#865)) - mark petgraph::dot::Dot::graph_fmt as public ([#866](#866)) - Add bidirectional Dijkstra algorithm ([#782](#782)) ### Performance - Make A* tie break on lower h-values ([#882](#882)) ### Refactor - add examples for scc algorithms and reorganize into dedicated module ([#830](#830)) - Remove unnecessary trait bounds from impls/methods ([#828](#828)) - replace uses of 'crate::util::zip' with 'core::iter::zip' ([#849](#849)) - Fix clippy (and other) lints ([#851](#851)) - Cleanup repo ([#854](#854)) - replace crate::util::enumerate with Iterator::enumerate ([#881](#881)) ### Testing - Add dependency list for 'quickcheck' feature ([#822](#822)) - Fix feature cfg capitalization in doctest ([#852](#852)) </blockquote> </p></details> --- This PR was generated with [release-plz](https://github.com/release-plz/release-plz/). --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Egor Starovoitov <52821033+starovoid@users.noreply.github.com>
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fixes #862
The stack-based implementation of SPFA produces false negatives when detecting negative cycles. When benchmarking without a negative cycle, it actually runs faster than Bellman-Ford.
Since the SPFA implementation uses a fixed-size(capacity) queue, no reallocation occurs in
VecDeque, so it is expected to be sufficiently fast.Before: 46082d6
After: 10051b2