43 lines
1.6 KiB
Plaintext
43 lines
1.6 KiB
Plaintext
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(function "quicksort" (lo: int hi: int a: addr)
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(if (< lo hi)
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(let (i lo
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j hi
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pivot (addraref a hi))
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(while (< i j)
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(catch
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(while 1
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(if (>= i hi) exit [])
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(if (> (addraref a i) pivot) exit [])
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(assign i (+ i 1)))
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with [])
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(catch
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(while 1
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(if (<= j lo) exit [])
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(if (< (addraref a j) pivot) exit [])
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(assign j (- j 1)))
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with [])
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(if (< i j)
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(let temp (addraref a i)
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(addraset a i (addraref a j))
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(addraset a j temp))
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[]))
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(let temp (addraref a i)
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(addraset a i (addraref a hi))
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(addraset a hi temp))
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(app "quicksort" [lo (- i 1) a] unit)
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(app "quicksort" [(+ i 1) hi a] unit))
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[]))
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