regress/sys/uvm/pdsim/rand.hs

   1 {-
   2 /*      $NetBSD: rand.hs,v 1.1 2006/09/30 08:50:32 yamt Exp $   */
   3
   4 /*-
   5  * Copyright (c)2005 YAMAMOTO Takashi,
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 -}
  30
  31 import System.Environment
  32 import System.IO
  33 import List
  34 import Maybe
  35 import Random
  36
  37 contain x xs = isJust $ find (== x) xs
  38
  39 deleteAt 0 (_:xs) = xs
  40 deleteAt at (x:xs) = x:deleteAt (at-1) xs
  41
  42 do_rand1 rg npg n q qlen [] = (reverse n, q)
  43 do_rand1 rg npg n q qlen rs@(r:rs2) =
  44         if contain r q then
  45                 do_rand1 rg npg n q qlen rs2
  46         else if qlen < npg then
  47                 do_rand1 rg npg (r:n) (r:q) (qlen+1) rs2
  48         else
  49                 let
  50                         (i, nrg) = next rg
  51                         at = i `mod` npg
  52                         nq = deleteAt at q
  53                 in
  54                 do_rand1 nrg npg (r:n) (r:nq) qlen rs2
  55
  56 do_rand npg rs = fst $ do_rand1 rg npg [] [] 0 rs
  57         where
  58                 rg = mkStdGen 0
  59
  60 main = do
  61         xs <- getContents
  62         args <- getArgs
  63         let
  64                 ls = lines xs
  65                 npgs::Int
  66                 npgs = read $ args !! 0
  67                 pgs::[Int]
  68                 pgs = map read ls
  69         mapM_ print $ do_rand npgs pgs