結果

問題 No.2007 Arbitrary Mod (Easy)
ユーザー terry_u16
提出日時 2022-07-15 21:23:49
言語 C#
(.NET 8.0.404)
結果
AC  
実行時間 53 ms / 2,000 ms
コード長 27,009 bytes
コンパイル時間 16,537 ms
コンパイル使用メモリ 167,760 KB
実行使用メモリ 190,356 KB
最終ジャッジ日時 2024-06-27 16:45:54
合計ジャッジ時間 20,928 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 30
権限があれば一括ダウンロードができます
コンパイルメッセージ
  復元対象のプロジェクトを決定しています...
  /home/judge/data/code/main.csproj を復元しました (107 ms)。
MSBuild のバージョン 17.9.6+a4ecab324 (.NET)
  main -> /home/judge/data/code/bin/Release/net8.0/main.dll
  main -> /home/judge/data/code/bin/Release/net8.0/publish/

ソースコード

diff #
プレゼンテーションモードにする

using System;
using System.Buffers;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics.X86;
using System.Text;
using YukicoderContest352.Problems;
using ModInt = YukicoderContest352.Problems.ProblemA.StaticModInt<YukicoderContest352.Problems.ProblemA.Mod1000000007>;
namespace YukicoderContest352.Problems
{
    public class ProblemA : ProblemBase
    {
        public ProblemA() : base(false) { }
        [MethodImpl(MethodImplOptions.AggressiveOptimization)]
        protected override void SolveEach(IOManager io)
        {
            var a = io.ReadInt();
            var n = io.ReadLong();
            io.WriteLine(ModInt.Mod);
            io.WriteLine(ModInt.Raw(a).Pow(n));
        }
        /// <summary>
        /// コンパイル時に決定する mod を表します。
        /// </summary>
        /// <example>
        /// <code>
        /// public readonly struct Mod1000000009 : IStaticMod
        /// {
        ///     public uint Mod => 1000000009;
        ///     public bool IsPrime => true;
        /// }
        /// </code>
        /// </example>
        public interface IStaticMod
        {
            /// <summary>
            /// mod を取得します。
            /// </summary>
            uint Mod { get; }
            /// <summary>
            /// mod が素数であるか識別します。
            /// </summary>
            bool IsPrime { get; }
        }
        public readonly struct Mod1000000007 : IStaticMod
        {
            public uint Mod => 1000000007;
            public bool IsPrime => true;
        }
        public readonly struct Mod998244353 : IStaticMod
        {
            public uint Mod => 998244353;
            public bool IsPrime => true;
        }
        /// <summary>
        /// 実行時に決定する mod の ID を表します。
        /// </summary>
        /// <example>
        /// <code>
        /// public readonly struct ModID123 : IDynamicModID { }
        /// </code>
        /// </example>
        public interface IDynamicModID { }
        public readonly struct ModID0 : IDynamicModID { }
        public readonly struct ModID1 : IDynamicModID { }
        public readonly struct ModID2 : IDynamicModID { }
        /// <summary>
        /// 四則演算時に自動で mod を取る整数型。mod の値はコンパイル時に決定している必要があります。
        /// </summary>
        /// <typeparam name="T">定数 mod を表す構造体</typeparam>
        /// <example>
        /// <code>
        /// using ModInt = AtCoder.StaticModInt&lt;AtCoder.Mod1000000007&gt;;
        ///
        /// void SomeMethod()
        /// {
        ///     var m = new ModInt(1);
        ///     m -= 2;
        ///     Console.WriteLine(m);   // 1000000006
        /// }
        /// </code>
        /// </example>
        public readonly struct StaticModInt<T> : IEquatable<StaticModInt<T>> where T : struct, IStaticMod
        {
            private readonly uint _v;
            /// <summary>
            /// 格納されている値を返します。
            /// </summary>
            public int Value => (int)_v;
            /// <summary>
            /// mod を返します。
            /// </summary>
            public static int Mod => (int)default(T).Mod;
            public static StaticModInt<T> Zero => new StaticModInt<T>();
            public static StaticModInt<T> One => new StaticModInt<T>(1u);
            /// <summary>
            /// <paramref name="v"/> に対して mod を取らずに StaticModInt&lt;<typeparamref name="T"/>&gt; 型のインスタンスを生成します。
            /// </summary>
            /// <remarks>
            /// <para>定数倍高速化のための関数です。 <paramref name="v"/> に 0 未満または mod 以上の値を入れた場合の挙動は未定義です。</para>
            /// <para>制約: 0≤|<paramref name="v"/>|&lt;mod</para>
            /// </remarks>
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public static StaticModInt<T> Raw(int v)
            {
                var u = unchecked((uint)v);
                Debug.Assert(u < Mod);
                return new StaticModInt<T>(u);
            }
            /// <summary>
            /// StaticModInt&lt;<typeparamref name="T"/>&gt; 型のインスタンスを生成します。
            /// </summary>
            /// <remarks>
            /// <paramref name="v"/>が 0 未満、もしくは mod 以上の場合、自動で mod を取ります。
            /// </remarks>
            public StaticModInt(long v) : this(Round(v)) { }
            private StaticModInt(uint v) => _v = v;
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            private static uint Round(long v)
            {
                var x = v % default(T).Mod;
                if (x < 0)
                {
                    x += default(T).Mod;
                }
                return (uint)x;
            }
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public static StaticModInt<T> operator ++(StaticModInt<T> value)
            {
                var v = value._v + 1;
                if (v == default(T).Mod)
                {
                    v = 0;
                }
                return new StaticModInt<T>(v);
            }
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public static StaticModInt<T> operator --(StaticModInt<T> value)
            {
                var v = value._v;
                if (v == 0)
                {
                    v = default(T).Mod;
                }
                return new StaticModInt<T>(v - 1);
            }
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public static StaticModInt<T> operator +(StaticModInt<T> lhs, StaticModInt<T> rhs)
            {
                var v = lhs._v + rhs._v;
                if (v >= default(T).Mod)
                {
                    v -= default(T).Mod;
                }
                return new StaticModInt<T>(v);
            }
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public static StaticModInt<T> operator -(StaticModInt<T> lhs, StaticModInt<T> rhs)
            {
                unchecked
                {
                    var v = lhs._v - rhs._v;
                    if (v >= default(T).Mod)
                    {
                        v += default(T).Mod;
                    }
                    return new StaticModInt<T>(v);
                }
            }
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public static StaticModInt<T> operator *(StaticModInt<T> lhs, StaticModInt<T> rhs)
            {
                return new StaticModInt<T>((uint)((ulong)lhs._v * rhs._v % default(T).Mod));
            }
            /// <summary>
            /// 除算を行います。
            /// </summary>
            /// <remarks>
            /// <para>- 制約: <paramref name="rhs"/> に乗法の逆元が存在する。（gcd(<paramref name="rhs"/>, mod) = 1）</para>
            /// <para>- 計算量: O(log(mod))</para>
            /// </remarks>
            public static StaticModInt<T> operator /(StaticModInt<T> lhs, StaticModInt<T> rhs) => lhs * rhs.Inverse();
            public static StaticModInt<T> operator +(StaticModInt<T> value) => value;
            public static StaticModInt<T> operator -(StaticModInt<T> value) => new StaticModInt<T>() - value;
            public static bool operator ==(StaticModInt<T> lhs, StaticModInt<T> rhs) => lhs._v == rhs._v;
            public static bool operator !=(StaticModInt<T> lhs, StaticModInt<T> rhs) => lhs._v != rhs._v;
            public static implicit operator StaticModInt<T>(int value) => new StaticModInt<T>(value);
            public static implicit operator StaticModInt<T>(long value) => new StaticModInt<T>(value);
            /// <summary>
            /// 自身を x として、x^<paramref name="n"/> を返します。
            /// </summary>
            /// <remarks>
            /// <para>制約: 0≤|<paramref name="n"/>|</para>
            /// <para>計算量: O(log(<paramref name="n"/>))</para>
            /// </remarks>
            public StaticModInt<T> Pow(long n)
            {
                Debug.Assert(0 <= n);
                var x = this;
                var r = Raw(1);
                while (n > 0)
                {
                    if ((n & 1) > 0)
                    {
                        r *= x;
                    }
                    x *= x;
                    n >>= 1;
                }
                return r;
            }
            /// <summary>
            /// 自身を x として、 xy≡1 なる y を返します。
            /// </summary>
            /// <remarks>
            /// <para>制約: gcd(x, mod) = 1</para>
            /// </remarks>
            [MethodImpl(MethodImplOptions.AggressiveInlining)]
            public StaticModInt<T> Inverse()
            {
                if (default(T).IsPrime)
                {
                    Debug.Assert(_v > 0);
                    return Pow(default(T).Mod - 2);
                }
                else
                {
                    var (g, x) = InternalMath.InvGCD(_v, default(T).Mod);
                    Debug.Assert(g == 1);
                    return new StaticModInt<T>(x);
                }
            }
            public override string ToString() => _v.ToString();
            public override bool Equals(object obj) => obj is StaticModInt<T> && Equals((StaticModInt<T>)obj);
            public bool Equals(StaticModInt<T> other) => Value == other.Value;
            public override int GetHashCode() => _v.GetHashCode();
        }
        public static class InternalMath
        {
            /// <summary>
            /// g=gcd(a,b),xa=g(mod b) となるような 0≤x&lt;b/g の(g, x)
            /// </summary>
            /// <remarks>
            /// <para>制約: 1≤<paramref name="b"/></para>
            /// </remarks>
            public static (long, long) InvGCD(long a, long b)
            {
                a = SafeMod(a, b);
                if (a == 0) return (b, 0);
                long s = b, t = a;
                long m0 = 0, m1 = 1;
                long u;
                while (true)
                {
                    if (t == 0)
                    {
                        if (m0 < 0) m0 += b / s;
                        return (s, m0);
                    }
                    u = s / t;
                    s -= t * u;
                    m0 -= m1 * u;
                    if (s == 0)
                    {
                        if (m1 < 0) m1 += b / t;
                        return (t, m1);
                    }
                    u = t / s;
                    t -= s * u;
                    m1 -= m0 * u;
                }
            }
            public static long SafeMod(long x, long m)
            {
                x %= m;
                if (x < 0) x += m;
                return x;
            }
        }
    }
}
namespace YukicoderContest352
{
    internal class Program
    {
        static void Main(string[] args)
        {
            IProblem question = new ProblemA();
            using var io = new IOManager(Console.OpenStandardInput(), Console.OpenStandardOutput());
            question.Solve(io);
        }
    }
}
#region Base Class
namespace YukicoderContest352.Problems
{
    public interface IProblem
    {
        string Solve(string input);
        void Solve(IOManager io);
    }
    public abstract class ProblemBase : IProblem
    {
        protected bool HasMultiTestCases { get; }
        protected ProblemBase(bool hasMultiTestCases) => HasMultiTestCases = hasMultiTestCases;
        public string Solve(string input)
        {
            var inputStream = new MemoryStream(Encoding.UTF8.GetBytes(input));
            var outputStream = new MemoryStream();
            using var manager = new IOManager(inputStream, outputStream);
            Solve(manager);
            manager.Flush();
            outputStream.Seek(0, SeekOrigin.Begin);
            var reader = new StreamReader(outputStream);
            return reader.ReadToEnd();
        }
        public void Solve(IOManager io)
        {
            var tests = HasMultiTestCases ? io.ReadInt() : 1;
            for (var t = 0; t < tests; t++)
            {
                SolveEach(io);
            }
        }
        protected abstract void SolveEach(IOManager io);
    }
}
#endregion
#region Utils
namespace YukicoderContest352
{
    public class IOManager : IDisposable
    {
        private readonly BinaryReader _reader;
        private readonly StreamWriter _writer;
        private bool _disposedValue;
        private byte[] _buffer = new byte[1024];
        private int _length;
        private int _cursor;
        private bool _eof;
        const char ValidFirstChar = '!';
        const char ValidLastChar = '~';
        public IOManager(Stream input, Stream output)
        {
            _reader = new BinaryReader(input);
            _writer = new StreamWriter(output) { AutoFlush = false };
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private char ReadAscii()
        {
            if (_cursor == _length)
            {
                _cursor = 0;
                _length = _reader.Read(_buffer);
                if (_length == 0)
                {
                    if (!_eof)
                    {
                        _eof = true;
                        return char.MinValue;
                    }
                    else
                    {
                        ThrowEndOfStreamException();
                    }
                }
            }
            return (char)_buffer[_cursor++];
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public char ReadChar()
        {
            char c;
            while (!IsValidChar(c = ReadAscii())) { }
            return c;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public string ReadString()
        {
            var builder = new StringBuilder();
            char c;
            while (!IsValidChar(c = ReadAscii())) { }
            do
            {
                builder.Append(c);
            } while (IsValidChar(c = ReadAscii()));
            return builder.ToString();
        }
        public int ReadInt() => (int)ReadLong();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public long ReadLong()
        {
            long result = 0;
            bool isPositive = true;
            char c;
            while (!IsNumericChar(c = ReadAscii())) { }
            if (c == '-')
            {
                isPositive = false;
                c = ReadAscii();
            }
            do
            {
                result *= 10;
                result += c - '0';
            } while (IsNumericChar(c = ReadAscii()));
            return isPositive ? result : -result;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private Span<char> ReadChunk(Span<char> span)
        {
            var i = 0;
            char c;
            while (!IsValidChar(c = ReadAscii())) { }
            do
            {
                span[i++] = c;
            } while (IsValidChar(c = ReadAscii()));
            return span.Slice(0, i);
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public double ReadDouble() => double.Parse(ReadChunk(stackalloc char[32]));
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public decimal ReadDecimal() => decimal.Parse(ReadChunk(stackalloc char[32]));
        public int[] ReadIntArray(int n)
        {
            var a = new int[n];
            for (int i = 0; i < a.Length; i++)
            {
                a[i] = ReadInt();
            }
            return a;
        }
        public long[] ReadLongArray(int n)
        {
            var a = new long[n];
            for (int i = 0; i < a.Length; i++)
            {
                a[i] = ReadLong();
            }
            return a;
        }
        public double[] ReadDoubleArray(int n)
        {
            var a = new double[n];
            for (int i = 0; i < a.Length; i++)
            {
                a[i] = ReadDouble();
            }
            return a;
        }
        public decimal[] ReadDecimalArray(int n)
        {
            var a = new decimal[n];
            for (int i = 0; i < a.Length; i++)
            {
                a[i] = ReadDecimal();
            }
            return a;
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Write<T>(T value) => _writer.Write(value.ToString());
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void WriteLine<T>(T value) => _writer.WriteLine(value.ToString());
        public void WriteLine<T>(IEnumerable<T> values, char separator)
        {
            var e = values.GetEnumerator();
            if (e.MoveNext())
            {
                _writer.Write(e.Current.ToString());
                while (e.MoveNext())
                {
                    _writer.Write(separator);
                    _writer.Write(e.Current.ToString());
                }
            }
            _writer.WriteLine();
        }
        public void WriteLine<T>(T[] values, char separator) => WriteLine((ReadOnlySpan<T>)values, separator);
        public void WriteLine<T>(Span<T> values, char separator) => WriteLine((ReadOnlySpan<T>)values, separator);
        public void WriteLine<T>(ReadOnlySpan<T> values, char separator)
        {
            for (int i = 0; i < values.Length - 1; i++)
            {
                _writer.Write(values[i]);
                _writer.Write(separator);
            }
            if (values.Length > 0)
            {
                _writer.Write(values[^1]);
            }
            _writer.WriteLine();
        }
        public void Flush() => _writer.Flush();
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static bool IsValidChar(char c) => ValidFirstChar <= c && c <= ValidLastChar;
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static bool IsNumericChar(char c) => ('0' <= c && c <= '9') || c == '-';
        private void ThrowEndOfStreamException() => throw new EndOfStreamException();
        protected virtual void Dispose(bool disposing)
        {
            if (!_disposedValue)
            {
                if (disposing)
                {
                    _reader.Dispose();
                    _writer.Flush();
                    _writer.Dispose();
                }
                _disposedValue = true;
            }
        }
        public void Dispose()
        {
            Dispose(disposing: true);
            GC.SuppressFinalize(this);
        }
    }
    public static class UtilExtensions
    {
        public static bool ChangeMax<T>(ref this T value, T other) where T : struct, IComparable<T>
        {
            if (value.CompareTo(other) < 0)
            {
                value = other;
                return true;
            }
            return false;
        }
        public static bool ChangeMin<T>(ref this T value, T other) where T : struct, IComparable<T>
        {
            if (value.CompareTo(other) > 0)
            {
                value = other;
                return true;
            }
            return false;
        }
        public static void SwapIfLargerThan<T>(ref this T a, ref T b) where T : struct, IComparable<T>
        {
            if (a.CompareTo(b) > 0)
            {
                (a, b) = (b, a);
            }
        }
        public static void SwapIfSmallerThan<T>(ref this T a, ref T b) where T : struct, IComparable<T>
        {
            if (a.CompareTo(b) < 0)
            {
                (a, b) = (b, a);
            }
        }
        public static void Sort<T>(this T[] array) where T : IComparable<T> => Array.Sort(array);
        public static void Sort<T>(this T[] array, Comparison<T> comparison) => Array.Sort(array, comparison);
    }
    public static class CollectionExtensions
    {
        private class ArrayWrapper<T>
        {
#pragma warning disable CS0649
            public T[] Array;
#pragma warning restore CS0649
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Span<T> AsSpan<T>(this List<T> list)
        {
            return Unsafe.As<ArrayWrapper<T>>(list).Array.AsSpan(0, list.Count);
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Span<T> GetRowSpan<T>(this T[,] array, int i)
        {
            var width = array.GetLength(1);
            return MemoryMarshal.CreateSpan(ref array[i, 0], width);
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Span<T> GetRowSpan<T>(this T[,,] array, int i, int j)
        {
            var width = array.GetLength(2);
            return MemoryMarshal.CreateSpan(ref array[i, j, 0], width);
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static Span<T> GetRowSpan<T>(this T[,,,] array, int i, int j, int k)
        {
            var width = array.GetLength(3);
            return MemoryMarshal.CreateSpan(ref array[i, j, k, 0], width);
        }
        public static void Fill<T>(this T[] array, T value) => array.AsSpan().Fill(value);
        public static void Fill<T>(this T[,] array, T value) => MemoryMarshal.CreateSpan(ref array[0, 0], array.Length).Fill(value);
        public static void Fill<T>(this T[,,] array, T value) => MemoryMarshal.CreateSpan(ref array[0, 0, 0], array.Length).Fill(value);
        public static void Fill<T>(this T[,,,] array, T value) => MemoryMarshal.CreateSpan(ref array[0, 0, 0, 0], array.Length).Fill(value);
    }
    public static class SearchExtensions
    {
        private struct LowerBoundComparer<T> : IComparer<T> where T : IComparable<T>
        {
            public int Compare(T x, T y) => 0 <= x.CompareTo(y) ? 1 : -1;
        }
        private struct UpperBoundComparer<T> : IComparer<T> where T : IComparable<T>
        {
            public int Compare(T x, T y) => 0 < x.CompareTo(y) ? 1 : -1;
        }
        // https://trsing.hatenablog.com/entry/2019/08/27/211038
        public static int GetGreaterEqualIndex<T>(this ReadOnlySpan<T> span, T inclusiveMin) where T : IComparable<T> => ~span.BinarySearch
            (inclusiveMin, new UpperBoundComparer<T>());
        public static int GetGreaterThanIndex<T>(this ReadOnlySpan<T> span, T exclusiveMin) where T : IComparable<T> => ~span.BinarySearch
            (exclusiveMin, new LowerBoundComparer<T>());
        public static int GetLessEqualIndex<T>(this ReadOnlySpan<T> span, T inclusiveMax) where T : IComparable<T> => ~span.BinarySearch(inclusiveMax
            , new LowerBoundComparer<T>()) - 1;
        public static int GetLessThanIndex<T>(this ReadOnlySpan<T> span, T exclusiveMax) where T : IComparable<T> => ~span.BinarySearch(exclusiveMax, 
            new UpperBoundComparer<T>()) - 1;
        public static int GetGreaterEqualIndex<T>(this Span<T> span, T inclusiveMin) where T : IComparable<T> => ((ReadOnlySpan<T>)span
            ).GetGreaterEqualIndex(inclusiveMin);
        public static int GetGreaterThanIndex<T>(this Span<T> span, T exclusiveMin) where T : IComparable<T> => ((ReadOnlySpan<T>)span
            ).GetGreaterThanIndex(exclusiveMin);
        public static int GetLessEqualIndex<T>(this Span<T> span, T inclusiveMax) where T : IComparable<T> => ((ReadOnlySpan<T>)span
            ).GetLessEqualIndex(inclusiveMax);
        public static int GetLessThanIndex<T>(this Span<T> span, T exclusiveMax) where T : IComparable<T> => ((ReadOnlySpan<T>)span).GetLessThanIndex
            (exclusiveMax);
        public static int BoundaryBinarySearch(Predicate<int> predicate, int ok, int ng)
        {
            while (Math.Abs(ok - ng) > 1)
            {
                var mid = (ok + ng) / 2;
                if (predicate(mid))
                {
                    ok = mid;
                }
                else
                {
                    ng = mid;
                }
            }
            return ok;
        }
        public static long BoundaryBinarySearch(Predicate<long> predicate, long ok, long ng)
        {
            while (Math.Abs(ok - ng) > 1)
            {
                var mid = (ok + ng) / 2;
                if (predicate(mid))
                {
                    ok = mid;
                }
                else
                {
                    ng = mid;
                }
            }
            return ok;
        }
        public static BigInteger BoundaryBinarySearch(Predicate<BigInteger> predicate, BigInteger ok, BigInteger ng)
        {
            while (BigInteger.Abs(ok - ng) > 1)
            {
                var mid = (ok + ng) / 2;
                if (predicate(mid))
                {
                    ok = mid;
                }
                else
                {
                    ng = mid;
                }
            }
            return ok;
        }
        public static double BoundaryBinarySearch(Predicate<double> predicate, double ok, double ng, double eps = 1e-9, int loopLimit = 1000)
        {
            var count = 0;
            while (Math.Abs(ok - ng) > eps && count++ < loopLimit)
            {
                var mid = (ok + ng) * 0.5;
                if (predicate(mid))
                {
                    ok = mid;
                }
                else
                {
                    ng = mid;
                }
            }
            return (ok + ng) * 0.5;
        }
        public static double Bisection(Func<double, double> f, double a, double b, double eps = 1e-9, int loopLimit = 100)
        {
            double mid = (a + b) / 2;
            var fa = f(a);
            if (fa * f(b) >= 0)
            {
                throw new ArgumentException("f(a)とf(b)は異符号である必要があります。");
            }
            for (int i = 0; i < loopLimit; i++)
            {
                var fmid = f(mid);
                var sign = fa * fmid;
                if (sign < 0)
                {
                    b = mid;
                }
                else if (sign > 0)
                {
                    a = mid;
                    fa = fmid;
                }
                else
                {
                    return mid;
                }
                mid = (a + b) / 2;
                if (Math.Abs(b - a) < eps)
                {
                    break;
                }
            }
            return mid;
        }
    }
}
#endregion
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