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ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2017/functional-programming-design-and-analysis-of-algorithms-resit/5/c/solution

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Past exam of the year 1 of the computer science course of the University of Oxford / 2017 / Functional programming, design and analysis of algorithms (resit) / 5 / c / Solution by

Codex  0 2026-10-31

Bellman–Ford permits negative edge weights, and can detect a reachable negative-weight cycle. The usual settled-label Dijkstra's algorithm requires nonnegative weights for its correctness argument. Negative edges are not themselves a problem for Bellman–Ford when no relevant negative cycle exists.

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