#1045178 (C#) No.3032 ホモトピー入門

• 問題: No.3032 ホモトピー入門
• ユーザー: tobisatis
• 提出日時: 2025-02-21 23:40:35
• 言語: C# (.NET 8.0.404)
• 結果: WA
• 実行時間: -
• コード長: 3,228 bytes
• コンパイル時間: 17,292 ms
• コンパイル使用メモリ: 169,972 KB
• 実行使用メモリ: 233,264 KB
• 最終ジャッジ日時: 2025-02-21 23:41:03
• 合計ジャッジ時間: 26,818 ms
• ジャッジサーバーID （参考情報）: judge5 / judge4

ファイルパターン	結果
sample	AC * 3
other	AC * 13 WA * 24

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 (122 ミリ秒)。
  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

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#nullable enable
using System.Numerics;
void Run()
{
    var n = Int();
    var m = Int();
    var cz = new (int, int)[n][];
    {
        var dd = new Dictionary<char, (int, int)>
        {
            ['L'] = (-1, 0),
            ['D'] = (0, -1),
            ['U'] = (0, 1),
            ['R'] = (1, 0),
        };
        for (var i = 0; i < n; i++)
        {
            var str = String();
            var cs = new Stack<(int, int)>();
            for (var j = 0; j < m; j++)
            {
                var d = dd[str[j]];
                var (dx, dy) = d;
                if (cs.Count > 0 && cs.Peek() == (-dx, -dy)) cs.Pop();
                else cs.Push(d);
            }
            cz[i] = cs.ToArray();
        }
    }
    var ans = 0;
    bool F(int i)
    {
        var c = cz[i];
        var (x, y) = (0, 0);
        var (lx, ly) = (0, 0);
        var tp = 0;
        var pu = false;
        for (var j = 0; j < c.Length; j++)
        {
            var (dx, dy) = c[j];
            if ((x, y) == (0, 0))
            {
                (lx, ly) = (dx, dy);
                if (ly > 0) pu ^= true;
            }
            if (x == 0 && y >= 0) tp += dx;
            x += dx;
            y += dy;
            if (x == 0 && y >= 0)
            {
                tp += dx;
                if (dy != 0) pu ^= true;
            }
            if ((x, y) == (0, 0))
            {
                if (tp != 0) return false;
                var l = (lx, ly);
                var d = (dx, dy);
                if (l == (0, 1) ^ d == (0, -1)) return false;
                if (tp != 0 || pu) return false;
            }
        }
        return true;
    }
    for (var i = 0; i < n; i++) if (F(i)) ans++;
    Out(ans);
}
#region
AtCoderIO _io_;
var _backend_ = new StandardIOBackend();
_io_ = new(){ Backend = _backend_ };
Run();
_backend_.Flush();
string String() => _io_.Next();
int Int() => int.Parse(String());
void Out(object? x, string? sep = null) => _io_.Out(x, sep);
class AtCoderIO
{
    public required StandardIOBackend Backend { get; init; }
    Memory<string> _input = Array.Empty<string>();
    int _iter = 0;
    public string Next()
    {
        while (_iter >= _input.Length) (_input, _iter) = (Backend.ReadLine().Split(' '), 0);
        return _input.Span[_iter++];
    }
    public void Out(object? x, string? separator = null)
    {
        if (x == null) return;
        separator ??= Environment.NewLine;
        if (x is System.Collections.IEnumerable a and not string)
        {
            var objects = a.Cast<object>();
            if (separator == Environment.NewLine && !objects.Any()) return;
            x = string.Join(separator, objects);
        }
        Backend.WriteLine(x);
    }
}
class StandardIOBackend
{
    readonly StreamReader _sr = new(Console.OpenStandardInput());
    readonly StreamWriter _sw = new(Console.OpenStandardOutput()) { AutoFlush = false };
    public string ReadLine() => _sr.ReadLine()!;
    public void WriteLine(object? value) => _sw.WriteLine(value);
    public void Flush() => _sw.Flush();
}
#endregion
static class Extensions
{
    public static T[] Repeat<T>(this int time, Func<T> F) => Enumerable.Range(0, time).Select(_ => F()).ToArray();
}
 
 
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