結果

問題 No.1051 PQ Permutation
ユーザー keymoon
提出日時 2020-05-08 22:52:28
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 278 ms / 2,000 ms
コード長 4,242 bytes
コンパイル時間 1,410 ms
コンパイル使用メモリ 111,744 KB
実行使用メモリ 46,800 KB
最終ジャッジ日時 2024-07-05 19:53:49
合計ジャッジ時間 8,591 ms
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 46
権限があれば一括ダウンロードができます
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc)
Copyright (C) Microsoft Corporation. All rights reserved.

ソースコード

diff #
プレゼンテーションモードにする

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
public static class P
{
public static void Main()
{
#if !DEBUG
var npq = Console.ReadLine().Split().Select(int.Parse).ToArray();
var n = npq[0];
var p = npq[1];
var q = npq[2];
var a = Console.ReadLine().Split().Select(int.Parse).ToArray();
int[] res = null;
if (Permutations(a).Take(2).Count() != 1)
{
//var nexta = Permutations(a).Take(2).Last();
//a = nexta;
res = Solve(n, p, q, a);
}
else res = null;
Console.WriteLine(res == null ? "-1" : string.Join(" ", res));
#else
int n = int.Parse(Console.ReadLine());
foreach (var perm in Permutations(Enumerable.Range(1, n).ToArray()))
{
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= n; j++)
{
if (i == j) continue;
var a = Stupid(n, i, j, perm);
var b = Solve(n, i, j, perm);
if (a != b && !a.SequenceEqual(b))
{
Console.WriteLine($"{n} {i} {j}\n{string.Join(" ", perm)}");
Console.ReadLine();
}
}
}
}
Console.WriteLine("end");
#endif
}
public static int[] Stupid(int n, int p, int q, int[] a)
{
var copied = a.ToArray();
foreach (var perm in Permutations(copied))
{
var pInd = Array.IndexOf(perm, p);
var qInd = Array.IndexOf(perm, q);
if (pInd < qInd) return perm;
}
return null;
}
public static int[] Solve(int n, int p, int q, int[] a)
{
var pInd = Array.IndexOf(a, p);
var qInd = Array.IndexOf(a, q);
if (pInd < qInd) { return a; }
//p<qq . . p qq
if (p < q)
{
//p, q, q
var target = a.Skip(qInd + 1).Max();
for (; qInd >= 0; qInd--)
{
if (a[qInd] < target) break;
if (a[qInd] != q) target = Max(target, a[qInd]);
}
if (qInd == -1) return null;
target = a.Skip(qInd).Where(x => a[qInd] < x && x != q).Min();
var res =
a.Take(qInd).Where(x => x != target)
.Concat(new int[] { target })
.Concat(a.Skip(qInd).Where(x => x != target).OrderBy(x => x)).ToArray();
return res;
}
//p>qq . . pp
else
{
var target = a.Skip(qInd).Where(x => x > q).Min();
var res =
a.Take(qInd)
.Concat(new int[] { target })
.Concat(a.Skip(qInd).Where(x => x != target && x != q && x <= p).OrderBy(x => x))
.Concat(new int[] { q })
.Concat(a.Skip(qInd).Where(x => x != target && x > p).OrderBy(x => x)).ToArray();
return res;
}
}
static IEnumerable<T[]> Permutations<T>(T[] array) where T : IComparable<T>
{
int index = 0;
yield return array;
while (true)
{
for (int i = array.Length - 1; i > 0; i--)
{
if (array[i - 1].CompareTo(array[i]) >= 0) continue;
int j = Array.FindLastIndex(array, x => array[i - 1].CompareTo(x) < 0);
T tmp = array[i - 1]; array[i - 1] = array[j]; array[j] = tmp;
Array.Reverse(array, i, array.Length - i);
yield return array;
goto end;
}
Array.Reverse(array, index, array.Length);
yield break;
end:;
}
}
}
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