Add johnson.
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parent
8a4d087a73
commit
709c1360b9
25
graph.rkt
25
graph.rkt
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@ -40,7 +40,7 @@
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min-st-kruskal max-st-kruskal min-st-prim max-st-prim
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min-st-kruskal max-st-kruskal min-st-prim max-st-prim
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bellman-ford dijkstra dag-shortest-paths
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bellman-ford dijkstra dag-shortest-paths
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floyd-warshall transitive-closure
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floyd-warshall transitive-closure johnson
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graphviz)
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graphviz)
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@ -210,6 +210,8 @@
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(g:floyd-warshall (gg g)))
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(g:floyd-warshall (gg g)))
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(define (transitive-closure g)
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(define (transitive-closure g)
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(g:transitive-closure (gg g)))
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(g:transitive-closure (gg g)))
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(define (johnson g)
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(g:johnson (gg g)))
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;; 10 Graphviz
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;; 10 Graphviz
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(define (graphviz g #:output [output #f] #:colors [colors #f])
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(define (graphviz g #:output [output #f] #:colors [colors #f])
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@ -313,6 +315,7 @@
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;; 7 All-pairs Shortest Paths
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;; 7 All-pairs Shortest Paths
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[floyd-warshall (-> Graph (Mutable-HashTable (List Any Any) Number))]
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[floyd-warshall (-> Graph (Mutable-HashTable (List Any Any) Number))]
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[transitive-closure (-> Graph (Mutable-HashTable (List Any Any) Boolean))]
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[transitive-closure (-> Graph (Mutable-HashTable (List Any Any) Boolean))]
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[johnson (-> Graph (Mutable-HashTable (List Any Any) Number))]
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;; 10 Graphviz
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;; 10 Graphviz
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[graphviz (->* (Graph)
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[graphviz (->* (Graph)
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@ -495,7 +498,25 @@
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((b d) . #t)
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((b d) . #t)
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((b b) . #t)
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((b b) . #t)
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((d b) . #f)
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((d b) . #f)
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((a b) . #t))))
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((a b) . #t)))
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(check-equal? (hash->ordered-list (johnson g0))
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'(((a d) . 4)
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((c c) . 0)
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((b a) . +inf.0)
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((a a) . 0)
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((d c) . +inf.0)
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((a c) . 2)
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((c b) . +inf.0)
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((d d) . 0)
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((c a) . +inf.0)
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((b c) . +inf.0)
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((d a) . +inf.0)
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((c d) . 3)
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((b d) . 3)
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((b b) . 0)
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((d b) . +inf.0)
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((a b) . 1))))
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(test-case "10 Graphviz"
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(test-case "10 Graphviz"
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(define g (directed-graph '((a b) (b c))))
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(define g (directed-graph '((a b) (b c))))
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