結果
| 問題 |
No.140 みんなで旅行
|
| コンテスト | |
| ユーザー |
 紙ぺーぱー
|
| 提出日時 | 2015-06-09 19:31:46 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 192 ms / 5,000 ms |
| コード長 | 6,961 bytes |
| コンパイル時間 | 1,011 ms |
| コンパイル使用メモリ | 111,232 KB |
| 実行使用メモリ | 28,800 KB |
| 最終ジャッジ日時 | 2024-07-06 15:13:14 |
| 合計ジャッジ時間 | 4,998 ms |
|
ジャッジサーバーID （参考情報） |
judge5 / judge2 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 19 |
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
using System;
using System.Linq;
using System.Collections.Generic;
using Debug = System.Diagnostics.Debug;
using StringBuilder = System.Text.StringBuilder;
using System.Numerics;
//using System.Threading.Tasks;
namespace Program
{
public class Solver
{
public void Solve()
{
var n = sc.Integer();
ModInteger ans = 0;
var table = new ModCombinationTable(1000);
var dp = new ModInteger[1000, 1000];
dp[0, 0] = 1;
for (int i = 0; i < 999; i++)
for (int j = 0; j < 999; j++)
{
dp[i + 1, j + 1] += dp[i, j];
dp[i + 1, j] += j * dp[i, j];
}
for (int i = 1; i <= n; i++)
{
for (int j = i; j <= n; j++)
{
var C = table[n, j];
ans += C * dp[j, i] * ModInteger.Pow(i * (i - 1), n - j);
}
}
IO.Printer.Out.WriteLine(ans);
}
public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());
static T[] Enumerate<T>(int n, Func<int, T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(i); return a; }
static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
}
}
#region main
static class Ex
{
static public string AsString(this IEnumerable<char> ie) { return new string(System.Linq.Enumerable.ToArray(ie)); }
static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ") { return string.Join(st, ie); }
static public void Main()
{
var solver = new Program.Solver();
solver.Solve();
Program.IO.Printer.Out.Flush();
}
}
#endregion
#region Ex
namespace Program.IO
{
using System.IO;
using System.Text;
using System.Globalization;
public class Printer : StreamWriter
{
static Printer() { Out = new Printer(Console.OpenStandardOutput()) { AutoFlush = false }; }
public static Printer Out { get; set; }
public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
public Printer(System.IO.Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
public Printer(System.IO.Stream stream, Encoding encoding) : base(stream, encoding) { }
public void Write<T>(string format, T[] source) { base.Write(format, source.OfType<object>().ToArray()); }
public void WriteLine<T>(string format, T[] source) { base.WriteLine(format, source.OfType<object>().ToArray()); }
}
public class StreamScanner
{
public StreamScanner(Stream stream) { str = stream; }
public readonly Stream str;
private readonly byte[] buf = new byte[1024];
private int len, ptr;
public bool isEof = false;
public bool IsEndOfStream { get { return isEof; } }
private byte read()
{
if (isEof) return 0;
if (ptr >= len) { ptr = 0; if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; } }
return buf[ptr++];
}
public char Char() { byte b = 0; do b = read(); while ((b < 33 || 126 < b) && !isEof); return (char)b; }
public string Scan()
{
var sb = new StringBuilder();
for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
sb.Append(b);
return sb.ToString();
}
public string ScanLine()
{
var sb = new StringBuilder();
for (var b = Char(); b != '\n'; b = (char)read())
if (b == 0) break;
else if (b != '\r') sb.Append(b);
return sb.ToString();
}
public long Long()
{
if (isEof) return long.MinValue;
long ret = 0; byte b = 0; var ng = false;
do b = read();
while (b != '-' && (b < '0' || '9' < b));
if (b == '-') { ng = true; b = read(); }
for (; true; b = read())
{
if (b < '0' || '9' < b)
return ng ? -ret : ret;
else ret = ret * 10 + b - '0';
}
}
public int Integer() { return (isEof) ? int.MinValue : (int)Long(); }
public double Double() { return double.Parse(Scan(), CultureInfo.InvariantCulture); }
private T[] enumerate<T>(int n, Func<T> f)
{
var a = new T[n];
for (int i = 0; i < n; ++i) a[i] = f();
return a;
}
public char[] Char(int n) { return enumerate(n, Char); }
public string[] Scan(int n) { return enumerate(n, Scan); }
public double[] Double(int n) { return enumerate(n, Double); }
public int[] Integer(int n) { return enumerate(n, Integer); }
public long[] Long(int n) { return enumerate(n, Long); }
}
}
#endregion
#region ModNumber
public partial struct ModInteger
{
public const long Mod = (long)1e9 + 7;
public long num;
public ModInteger(long n) : this() { num = n % Mod; }
public override string ToString() { return num.ToString(); }
public static ModInteger operator +(ModInteger l, ModInteger r) { var n = l.num + r.num; if (n >= Mod)n -= Mod; return new ModInteger(n); }
public static ModInteger operator -(ModInteger l, ModInteger r) { var n = l.num - r.num; if (n < 0)n += Mod; return new ModInteger(n); }
public static ModInteger operator *(ModInteger l, ModInteger r) { return new ModInteger((l.num * r.num) % Mod); }
public static implicit operator ModInteger(long n) { return new ModInteger(n); }
}
#endregion
#region CombinationTable
public class ModCombinationTable
{
ModInteger[][] nCr;
public ModCombinationTable(int n)
{
nCr = new ModInteger[n + 1][];
for (int i = 0; i <= n; i++)
nCr[i] = new ModInteger[i + 2];
nCr[0][0] = 1;
for (int i = 0; i <= n; i++)
{
nCr[i][0] = 1;
for (int j = 1; j <= i; j++)
nCr[i][j] = nCr[i - 1][j - 1] + nCr[i - 1][j];
}
}
public ModInteger this[int n, int r]
{
get
{
if (n < 0 || n > nCr.Length)
throw new IndexOutOfRangeException("n<=0 || n>N ");
if (r < 0 || r > n)
throw new IndexOutOfRangeException("r<=0 ||r>n");
return nCr[n][r];
}
}
public ModInteger RepeatedCombination(int n, int k)
{
if (k == 0) return 1;
return this[n + k - 1, k];
}
}
#endregion
#region ModPow
public partial struct ModInteger
{
static public ModInteger Pow(ModInteger v, ModInteger k)
{
ModInteger ret = 1;
var n = k.num;
for (; n > 0; n >>= 1, v *= v)
{
if ((n & 1) == 1)
ret = ret * v;
}
return ret;
}
}
#endregion