結果
問題 | No.573 a^2[i] = a[i] |
ユーザー |
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提出日時 | 2017-10-14 01:20:19 |
言語 | C#(csc) (csc 3.9.0) |
結果 |
AC
|
実行時間 | 160 ms / 2,000 ms |
コード長 | 1,949 bytes |
コンパイル時間 | 4,195 ms |
コンパイル使用メモリ | 104,448 KB |
実行使用メモリ | 17,664 KB |
最終ジャッジ日時 | 2024-11-17 12:22:52 |
合計ジャッジ時間 | 3,762 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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ファイルパターン | 結果 |
---|---|
other | AC * 47 |
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.Collections;using System.Collections.Generic;using System.Collections.Specialized;using System.Text;using System.Text.RegularExpressions;using System.Linq;using System.IO;using System.Diagnostics;class Scanner{private readonly char Separator = ' ';private int Index = 0;private string[] Line = new string[0];public string Next(){if (Index >= Line.Length){Line = Console.ReadLine().Split(Separator);Index = 0;}var ret = Line[Index];Index++;return ret;}public int NextInt(){return int.Parse(Next());}}class Magatro{private readonly int Mod = (int)1e9 + 7;private int N;private long[] F;private void Scan(){N = int.Parse(Console.ReadLine());}private void ClacF(){F = new long[N+1];F[0] = 1;for (int i = 1; i <= N; i++){F[i] = (F[i - 1] * i) % Mod;}}private long Fact(long n){return F[n];}private long Pow(long a, long b){long res = 1;while (b > 0){if (b % 2 == 1){res *= a;res %= Mod;}b /= 2;a *= a;a %= Mod;}return res;}private long C(long n, long m){long bunsi = Fact(n);long bunbo = (Fact(m) * Fact(n - m)) % Mod;long gyakugen = Pow(bunbo, Mod - 2);return (bunsi * gyakugen) % Mod;}public void Solve(){Scan();ClacF();long ans = 0;for(int i=1;i<=N;i++){ans += (C(N, i) * Pow(i, N - i))%Mod;ans %= Mod;}Console.WriteLine(ans);}static public void Main(){new Magatro().Solve();}}