1{-
2/*	$NetBSD: opt.hs,v 1.1 2006/09/30 08:50:32 yamt Exp $	*/
3
4/*-
5 * Copyright (c)2006 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 qualified Data.Set as Set
36
37ff s [] = head $ Set.elems s
38ff s (y:ys) =
39	if Set.size s == 1 then head $ Set.elems s else
40	if Set.member y s then
41		ff (Set.delete y s) ys
42	else
43		ff s ys
44
45do_opt1 npg n q [] = (reverse n, q)
46do_opt1 npg n q rs@(r:rs2) =
47	if Set.member r q then
48		do_opt1 npg n q rs2
49	else if Set.size q < npg then
50		do_opt1 npg (r:n) (Set.insert r q) rs2
51	else
52		let
53			c = ff q rs2
54			nq = Set.delete c q
55		in
56		do_opt1 npg (r:n) (Set.insert r nq) rs2
57
58do_opt npg rs = fst $ do_opt1 npg [] Set.empty rs
59do_opt_dbg npg rs = do_opt1 npg [] Set.empty rs
60
61main = do
62	xs <- getContents
63	args <- getArgs
64	let
65		ls = lines xs
66		npgs::Int
67		npgs = read $ args !! 0
68		pgs::[Int]
69		pgs = map read ls
70	mapM_ print $ do_opt npgs pgs
71