search←{                    ⍝ Breadth-first search of graph ⍺.
    graph←⍺                 ⍝ ⍺ is graph vector.
    ⍵{                      ⍝ from starting vertex.
        ⍵≡⍬:⍺               ⍝ no unvisited vertices: done.
        adjv←⍵⊃¨⊂graph      ⍝ adjacent vertices.
        next←∪(↑,/adjv)~⍺   ⍝ unvisited vertices.
        (⍺,next)next      ⍝ advance wave of visited vertices.
    }⍵                      ⍝ from starting vertex.
}
code_colours

test script

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