結果
問題 |
No.741 AscNumber(Easy)
|
ユーザー |
![]() |
提出日時 | 2018-10-11 03:47:26 |
言語 | C#(csc) (csc 3.9.0) |
結果 |
AC
|
実行時間 | 53 ms / 2,000 ms |
コード長 | 3,064 bytes |
コンパイル時間 | 915 ms |
コンパイル使用メモリ | 113,488 KB |
実行使用メモリ | 32,764 KB |
最終ジャッジ日時 | 2024-10-12 17:31:54 |
合計ジャッジ時間 | 3,563 ms |
ジャッジサーバーID (参考情報) |
judge / judge2 |
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ファイルパターン | 結果 |
---|---|
other | AC * 55 |
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; namespace No741_Ex { public class Program { public static void Main(string[] args) { var N = int.Parse(Console.ReadLine()); var comb = new Combination(N + 10); Console.WriteLine(comb.NCK(N + 9, 9)); } } public class Combination { readonly ModInt[] facts; public Combination(int max) { facts = new ModInt[max + 1]; facts[0] = 1; for (var i = 1; i <= max; i++) facts[i] = facts[i - 1] * i; } public ModInt Fact(int n) { return facts[n]; } public ModInt NCK(int n, int k) { if (n < k) return 0; return facts[n] / facts[k] / facts[n - k]; } public ModInt NPK(int n, int k) { if (n < k) return 0; return facts[n] / facts[n - k]; } public ModInt NHK(int n, int k) { if (k == 0) return 1; if (n == 0) return 0; return facts[n + k - 1] / facts[k] / facts[n - 1]; } } public struct ModInt { public static int Mod = 1000000007; readonly long value; public int Value { get { return (int)value; } } public ModInt Inverse { get { return GetInverse(); } } public ModInt(long value) { value %= Mod; this.value = value < 0 ? value + Mod : value; } ModInt GetInverse() { if (value == 0) throw new InvalidOperationException("value must NOT equal 0"); return Pow(Mod - 2); } public ModInt Square() { return this * this; } public ModInt Pow(long exp) { if (exp == 0) return 1; if (exp % 2 == 0) return Pow(exp / 2).Square(); return this * Pow(exp - 1); } public static ModInt Parse(string str) { return long.Parse(str); } public static implicit operator ModInt(long value) { return new ModInt(value); } public static ModInt operator +(ModInt left, ModInt right) { return left.value + right.value; } public static ModInt operator -(ModInt left, ModInt right) { return left.value - right.value; } public static ModInt operator *(ModInt left, ModInt right) { return left.value * right.value; } public static ModInt operator /(ModInt left, ModInt right) { return left * right.Inverse; } public override bool Equals(object obj) { if (!(obj is ModInt)) return false; return value == ((ModInt)obj).value; } public override int GetHashCode() { return value.GetHashCode(); } public override string ToString() { return value.ToString(); } } }