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Knuth-Morris-Pratt prefix (⎕IO←0)
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| ∇ P←prefix s;m;i;j | |
| m←≢s | |
| P←0⍴⍨m | |
| j←0 | |
| :for i :in 1+⍳¯1+m | |
| :while j≥0 | |
| :if s[j]=s[i] | |
| :leave | |
| :endif | |
| :if (j-1)≥0 | |
| j←P[j-1] | |
| :else | |
| j←¯1 | |
| :endif | |
| :endwhile | |
| j+←1 | |
| P[i]←j | |
| :endfor | |
| ∇ |
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https://brilliant.org/wiki/knuth-morris-pratt-algorithm/