結果
| 問題 | No.389 ロジックパズルの組み合わせ | 
| コンテスト | |
| ユーザー |  AreTrash | 
| 提出日時 | 2018-03-15 14:00:59 | 
| 言語 | C#(csc) (csc 3.9.0) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 160 ms / 2,000 ms | 
| コード長 | 4,345 bytes | 
| コンパイル時間 | 2,236 ms | 
| コンパイル使用メモリ | 117,416 KB | 
| 実行使用メモリ | 46,208 KB | 
| 最終ジャッジ日時 | 2024-12-16 09:50:11 | 
| 合計ジャッジ時間 | 9,154 ms | 
| ジャッジサーバーID (参考情報) | judge1 / judge2 | 
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| ファイルパターン | 結果 | 
|---|---|
| other | AC * 99 | 
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.IO;
using System.Collections.Generic;
using System.Linq;
namespace No389_1
{
    public class Program
    {
        void Solve(StreamWriter sw)
        {
            //---------------------------------
            var M = int.Parse(Console.ReadLine());
            var H = Console.ReadLine().Split(new []{' '}, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();
            var K = H.Length;
            if (K == 1 && H[0] == 0)
            {
                sw.WriteLine(1);
                return;
            }
            if (M < H.Sum() + K - 1)
            {
                sw.WriteLine("NA");
                return;
            }
            var comb = new Combination(M);
            sw.WriteLine(comb.NCK(M - H.Sum() + 1, K));
            //---------------------------------
        }
        static void Main()
        {
            var sw = new StreamWriter(Console.OpenStandardOutput()) {AutoFlush = false};
            new Program().Solve(sw);
            sw.Flush();
        }
    }
    public static partial class MathX
    {
        public static int GcdEx(int a, int b, out int x, out int y)
        {
            if (b == 0)
            {
                x = 1;
                y = 0;
                return a;
            }
            int tx, ty;
            var gcd = GcdEx(b, a % b, out tx, out ty);
            x = ty;
            y = tx - ty * (a / b);
            return gcd;
        }
    }
    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()
        {
            int x, y;
            if (MathX.GcdEx(Value, Mod, out x, out y) != 1)
            {
                throw new InvalidOperationException("'Value' and 'Mod' must be disjoint.");
            }
            return x;
        }
        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();
        }
    }
    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];
        }
    }
}
            
            
            
        