Question: How can we use the Floyd - Warshall algorithm for all - pairs shortest paths to detect whether a graph has a negative cycle? Check

How can we use the Floyd-Warshall algorithm for all-pairs shortest paths to detect whether a graph has a negative cycle?
Check if any shortest path entry A[i][j] is negative.
Check if any shortest path entry A[i][i] is negative.
Check if any shortest path entry A[i][j] reduces from one iteration to the next.
The Floyd-Warshall algorithm cannot be used to detect negative cycles.

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