#680624 (C#) No.1612 I hate Construct a Palindrome

提出ソース

結果

問題	No.1612 I hate Construct a Palindrome
ユーザー	terry_u16
提出日時	2021-07-21 23:05:45
言語	C# (.NET 8.0.203)
結果	AC
実行時間	564 ms / 2,000 ms
コード長	21,623 bytes
コンパイル時間	9,772 ms
コンパイル使用メモリ	170,024 KB
実行使用メモリ	197,224 KB
最終ジャッジ日時	2024-07-17 20:14:22
合計ジャッジ時間	18,118 ms
ジャッジサーバーID （参考情報）	judge5 / judge1

このコードへのチャレンジ
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テストケース

テストケース表示

入力	結果	実行時間実行使用メモリ
testcase_00	AC	66 ms 33,280 KB
testcase_01	AC	66 ms 33,920 KB
testcase_02	AC	288 ms 102,304 KB
testcase_03	AC	66 ms 33,536 KB
testcase_04	AC	67 ms 34,048 KB
testcase_05	AC	309 ms 102,292 KB
testcase_06	AC	301 ms 96,408 KB
testcase_07	AC	299 ms 96,788 KB
testcase_08	AC	299 ms 95,892 KB
testcase_09	AC	320 ms 98,332 KB
testcase_10	AC	361 ms 98,328 KB
testcase_11	AC	348 ms 98,192 KB
testcase_12	AC	338 ms 99,640 KB
testcase_13	AC	331 ms 99,636 KB
testcase_14	AC	335 ms 99,644 KB
testcase_15	AC	564 ms 120,052 KB
testcase_16	AC	537 ms 120,056 KB
testcase_17	AC	527 ms 120,312 KB
testcase_18	AC	67 ms 33,920 KB
testcase_19	AC	68 ms 34,276 KB
testcase_20	AC	66 ms 34,152 KB
testcase_21	AC	68 ms 33,900 KB
testcase_22	AC	66 ms 33,920 KB
testcase_23	AC	66 ms 34,276 KB
testcase_24	AC	67 ms 34,304 KB
testcase_25	AC	71 ms 34,048 KB
testcase_26	AC	71 ms 34,432 KB
testcase_27	AC	67 ms 33,664 KB
testcase_28	AC	68 ms 33,536 KB
testcase_29	AC	67 ms 35,328 KB
testcase_30	AC	69 ms 33,536 KB
testcase_31	AC	67 ms 33,664 KB
testcase_32	AC	68 ms 33,536 KB
testcase_33	AC	67 ms 33,152 KB
testcase_34	AC	68 ms 33,372 KB
testcase_35	AC	67 ms 33,664 KB
testcase_36	AC	66 ms 34,944 KB
testcase_37	AC	67 ms 33,536 KB
testcase_38	AC	67 ms 197,224 KB

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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 (101 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

raw source code

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 YukicoderContest305.Problems;

namespace YukicoderContest305.Problems
{
    public class ProblemC : ProblemBase
    {
        public ProblemC() : base(false) { }

        [MethodImpl(MethodImplOptions.AggressiveOptimization)]
        protected override void SolveEach(IOManager io)
        {
            var n = io.ReadInt();
            var m = io.ReadInt();
            var graph = Enumerable.Repeat(0, 4 * n).Select(_ => new List<(int v, int index, char c)>()).ToArray();
            var edges = new (int u, int v, char c)[m];
            var charCounts = new int[26];
            var from = new (int v, int index, char c)[4 * n];
            from.Fill((-1, -1, '_'));

            for (int i = 0; i < m; i++)
            {
                var u = io.ReadInt();
                var v = io.ReadInt();
                var c = io.ReadChar();
                u--;
                v--;

                edges[i] = (u, v, c);
                charCounts[c - 'a']++;
            }

            var except = 0;

            while (charCounts[except] == 0)
            {
                except++;
            }

            if (charCounts[except] == m)
            {
                io.WriteLine(-1);
                return;
            }

            for (int i = 0; i < m; i++)
            {
                var (u, v, c) = edges[i];

                var flag = c - 'a' == except ? 1 : 2;

                for (int lastFlag = 0; lastFlag < 4; lastFlag++)
                {
                    graph[ToIndex(lastFlag, u)].Add((ToIndex(lastFlag | flag, v), i, c));
                    graph[ToIndex(lastFlag, v)].Add((ToIndex(lastFlag | flag, u), i, c));
                }
            }

            var queue = new Queue<int>();
            queue.Enqueue(ToIndex(0, 0));
            var distances = new int[4 * n];
            distances.Fill(int.MaxValue);
            distances[0] = 0;

            while (queue.Count > 0)
            {
                var current = queue.Dequeue();

                foreach (var (next, index, c) in graph[current].AsSpan())
                {
                    if (distances[next].ChangeMin(distances[current] + 1))
                    {
                        from[next] = (current, index, c);
                        queue.Enqueue(next);
                    }
                }
            }

            if (distances[ToIndex(3, n - 1)] == int.MaxValue)
            {
                io.WriteLine(-1);
                return;
            }

            var revCurrent = ToIndex(3, n - 1);
            var sb = new StringBuilder(distances[revCurrent]);
            var history = new Stack<int>();

            while (from[revCurrent] != (-1, -1, '_'))
            {
                history.Push(from[revCurrent].index);
                sb.Append(from[revCurrent].c);
                revCurrent = from[revCurrent].v;
            }

            while (IsPalindrome(sb))
            {
                for (int i = 0; i < 2; i++)
                {
                    sb.Append(graph[0][0].c);
                    history.Push(graph[0][0].index);
                }
            }

            if (history.Count > 2 * n)
            {
                throw new Exception();
            }

            io.WriteLine(history.Count);

            while (history.Count > 0)
            {
                io.WriteLine(history.Pop() + 1);
            }

            int ToIndex(int c, int v) => c * n + v;
        }

        bool IsPalindrome(StringBuilder sb)
        {
            for (int i = 0; i < sb.Length; i++)
            {
                if (sb[i] != sb[sb.Length - i - 1])
                {
                    return false;
                }
            }

            return true;
        }


        public interface IEdge
        {
            int To { get; }
        }

        public interface IWeightedEdge : IEdge
        {
            long Weight { get; }
        }

        public interface IGraph<TEdge> where TEdge : IEdge
        {
            ReadOnlySpan<TEdge> this[int node] { get; }
            int NodeCount { get; }
        }

        public interface IWeightedGraph<TEdge> : IGraph<TEdge> where TEdge : IWeightedEdge { }

        public readonly struct BasicEdge : IEdge
        {
            public int To { get; }

            public BasicEdge(int to)
            {
                To = to;
            }

            public override string ToString() => To.ToString();
            public static implicit operator BasicEdge(int edge) => new BasicEdge(edge);
            public static implicit operator int(BasicEdge edge) => edge.To;
        }

        [StructLayout(LayoutKind.Auto)]
        public readonly struct WeightedEdge : IWeightedEdge
        {
            public int To { get; }
            public long Weight { get; }

            public WeightedEdge(int to) : this(to, 1) { }

            public WeightedEdge(int to, long weight)
            {
                To = to;
                Weight = weight;
            }

            public override string ToString() => $"[{Weight}]-->{To}";
            public void Deconstruct(out int to, out long weight) => (to, weight) = (To, Weight);
        }

        public class BasicGraph : IGraph<BasicEdge>
        {
            private readonly List<List<BasicEdge>> _edges;
            public ReadOnlySpan<BasicEdge> this[int node] => _edges[node].AsSpan();
            public int NodeCount => _edges.Count;

            public BasicGraph(int nodeCount)
            {
                _edges = new List<List<BasicEdge>>(nodeCount);
                for (int i = 0; i < nodeCount; i++)
                {
                    _edges.Add(new List<BasicEdge>());
                }
            }

            public void AddEdge(int from, int to) => _edges[from].Add(to);
            public void AddNode() => _edges.Add(new List<BasicEdge>());
        }
    }
}

namespace YukicoderContest305
{
    class Program
    {
        static void Main(string[] args)
        {
            IProblem question = new ProblemC();
            using var io = new IOManager(Console.OpenStandardInput(), Console.OpenStandardOutput());
            question.Solve(io);
        }
    }
}

#region Base Class

namespace YukicoderContest305.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 YukicoderContest305
{
    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
    {
        struct LowerBoundComparer<T> : IComparer<T> where T : IComparable<T>
        {
            public int Compare(T x, T y) => 0 <= x.CompareTo(y) ? 1 : -1;
        }

        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)
        {
            if (f(a) * 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。");
            }

            const int maxLoop = 100;
            double mid = (a + b) / 2;

            for (int i = 0; i < maxLoop; i++)
            {
                if (f(a) * f(mid) < 0)
                {
                    b = mid;
                }
                else
                {
                    a = mid;
                }
                mid = (a + b) / 2;
                if (Math.Abs(b - a) < eps)
                {
                    break;
                }
            }
            return mid;
        }
    }
}

#endregion

yukicoder

結果

テストケース

コンパイルメッセージ

ソースコード