1{- 2/* $NetBSD: rand.hs,v 1.1 2006/10/09 12:32:46 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 31import System.Environment 32import System.IO 33import List 34import Maybe 35import Random 36 37contain x xs = isJust $ find (== x) xs 38 39deleteAt 0 (_:xs) = xs 40deleteAt at (x:xs) = x:deleteAt (at-1) xs 41 42do_rand1 rg npg n q qlen [] = (reverse n, q) 43do_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 56do_rand npg rs = fst $ do_rand1 rg npg [] [] 0 rs 57 where 58 rg = mkStdGen 0 59 60main = 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 70