#119432 (C#(csc)) No.425 ジャンケンの必勝法

• 問題: No.425 ジャンケンの必勝法
• ユーザー: 紙ぺーぱー
• 提出日時: 2016-09-25 13:02:07
• 言語: C#(csc) (csc 3.9.0)
• 結果: AC
• 実行時間: 46 ms / 2,000 ms
• コード長: 4,874 bytes
• コンパイル時間: 904 ms
• コンパイル使用メモリ: 119,824 KB
• 実行使用メモリ: 18,944 KB
• 最終ジャッジ日時: 2024-04-29 09:21:51
• 合計ジャッジ時間: 2,622 ms
• ジャッジサーバーID （参考情報）: judge3 / judge5

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	38 ms; 18,944 KB
testcase_01	AC	39 ms; 18,944 KB
testcase_02	AC	39 ms; 18,816 KB
testcase_03	AC	40 ms; 18,816 KB
testcase_04	AC	41 ms; 18,688 KB
testcase_05	AC	40 ms; 18,688 KB
testcase_06	AC	39 ms; 18,816 KB
testcase_07	AC	42 ms; 18,816 KB
testcase_08	AC	40 ms; 18,816 KB
testcase_09	AC	41 ms; 18,816 KB
testcase_10	AC	41 ms; 18,944 KB
testcase_11	AC	43 ms; 18,816 KB
testcase_12	AC	45 ms; 18,816 KB
testcase_13	AC	45 ms; 18,688 KB
testcase_14	AC	46 ms; 18,816 KB
testcase_15	AC	42 ms; 18,944 KB
testcase_16	AC	44 ms; 18,944 KB
testcase_17	AC	40 ms; 18,944 KB
testcase_18	AC	37 ms; 18,816 KB
testcase_19	AC	39 ms; 18,816 KB
testcase_20	AC	41 ms; 18,944 KB
testcase_21	AC	44 ms; 18,944 KB
testcase_22	AC	45 ms; 18,688 KB

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.Linq.Expressions;
using System.Collections.Generic;
using Debug = System.Diagnostics.Debug;
using StringBuilder = System.Text.StringBuilder;
using System.Numerics;
using Number = System.Int64;
namespace Program
{
    public class Solver
    {
        public void Solve()
        {
            var p0 = sc.Integer() / 100.0;
            var q = sc.Integer() / 100.0;
            Func<int, double, double> dfs = null;

            dfs = (k, p) =>
              {
                  if (k == 20) return 1.0 / 2;
                  var x = 0.5 * (1 + dfs(k + 1, Math.Max(0, p - q)));
                  var y = 1.0 / 3 * (1 + dfs(k + 1, Math.Min(1, p + q)));
                  return p * x + (1 - p) * y;
              };
            var ans = 1.0 / 3 * (1 + dfs(0, p0));
            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 != 0 && b != '-' && (b < '0' || '9' < b));
            if (b == 0) return long.MinValue;
            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() { var s = Scan(); return s != "" ? double.Parse(s, CultureInfo.InvariantCulture) : double.NaN; }
        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