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Add SimpleCycles function #39
Description
There should be a SimpleCycles standalone function that detects all simple cycles in a given graph.
Analogous to functions like StronglyConnectedComponents, SimpleCycles should store the hashes of the vertices that form a cycle as a []K and return all of them as a slice, so that the return type is[][]K.
Example
In the graph shown above, there are two cycles: 1-2-4 and 2-3-5. This is how SimpleCycle should look and work like:
g := graph.New(graph.IntHash)
// Add vertices and edges ...
cycles, _ := graph.SimpleCycles(g)
fmt.Println(cycles)[[1 2 4] [2 3 5]]
The function signature should be SimpleCycles[K comparable, T any](g Graph[K, T]) ([][]K, error).
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