結果

問題 No.5017 Tool-assisted Shooting
ユーザー KumaTachiRenKumaTachiRen
提出日時 2023-07-16 17:00:57
言語 C#
(.NET 8.0.203)
結果
AC  
実行時間 438 ms / 2,000 ms
コード長 20,122 bytes
コンパイル時間 14,426 ms
コンパイル使用メモリ 144,600 KB
実行使用メモリ 53,884 KB
スコア 197,346
平均クエリ数 1160.25
最終ジャッジ日時 2023-07-16 17:01:50
合計ジャッジ時間 49,381 ms
ジャッジサーバーID
（参考情報） 		judge17 / judge12
純コード判定しない問題か言語
このコードへのチャレンジ
（要ログイン）

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 260 ms
49,428 KB
testcase_01 AC 296 ms
49,752 KB
testcase_02 AC 381 ms
50,136 KB
testcase_03 AC 342 ms
52,244 KB
testcase_04 AC 325 ms
51,852 KB
testcase_05 AC 361 ms
48,868 KB
testcase_06 AC 345 ms
49,500 KB
testcase_07 AC 239 ms
50,532 KB
testcase_08 AC 328 ms
52,384 KB
testcase_09 AC 320 ms
49,424 KB
testcase_10 AC 256 ms
51,592 KB
testcase_11 AC 334 ms
51,988 KB
testcase_12 AC 342 ms
51,488 KB
testcase_13 AC 312 ms
49,984 KB
testcase_14 AC 317 ms
49,084 KB
testcase_15 AC 298 ms
52,048 KB
testcase_16 AC 299 ms
51,872 KB
testcase_17 AC 326 ms
52,584 KB
testcase_18 AC 251 ms
49,516 KB
testcase_19 AC 318 ms
51,412 KB
testcase_20 AC 335 ms
49,688 KB
testcase_21 AC 363 ms
51,300 KB
testcase_22 AC 242 ms
49,584 KB
testcase_23 AC 340 ms
50,772 KB
testcase_24 AC 275 ms
52,400 KB
testcase_25 AC 325 ms
52,164 KB
testcase_26 AC 220 ms
51,136 KB
testcase_27 AC 323 ms
50,668 KB
testcase_28 AC 312 ms
50,868 KB
testcase_29 AC 251 ms
51,864 KB
testcase_30 AC 229 ms
52,376 KB
testcase_31 AC 314 ms
50,284 KB
testcase_32 AC 333 ms
49,812 KB
testcase_33 AC 332 ms
48,764 KB
testcase_34 AC 251 ms
52,252 KB
testcase_35 AC 349 ms
52,444 KB
testcase_36 AC 252 ms
51,176 KB
testcase_37 AC 319 ms
49,736 KB
testcase_38 AC 296 ms
49,608 KB
testcase_39 AC 352 ms
51,408 KB
testcase_40 AC 291 ms
50,680 KB
testcase_41 AC 309 ms
51,468 KB
testcase_42 AC 322 ms
50,960 KB
testcase_43 AC 358 ms
51,428 KB
testcase_44 AC 308 ms
49,188 KB
testcase_45 AC 336 ms
51,740 KB
testcase_46 AC 334 ms
49,480 KB
testcase_47 AC 351 ms
49,588 KB
testcase_48 AC 267 ms
49,488 KB
testcase_49 AC 340 ms
50,980 KB
testcase_50 AC 377 ms
53,568 KB
testcase_51 AC 309 ms
51,348 KB
testcase_52 AC 345 ms
50,996 KB
testcase_53 AC 367 ms
49,168 KB
testcase_54 AC 319 ms
49,528 KB
testcase_55 AC 267 ms
49,656 KB
testcase_56 AC 350 ms
49,576 KB
testcase_57 AC 327 ms
51,872 KB
testcase_58 AC 246 ms
48,868 KB
testcase_59 AC 317 ms
49,828 KB
testcase_60 AC 259 ms
51,316 KB
testcase_61 AC 322 ms
50,740 KB
testcase_62 AC 344 ms
52,156 KB
testcase_63 AC 287 ms
50,184 KB
testcase_64 AC 340 ms
49,472 KB
testcase_65 AC 303 ms
49,240 KB
testcase_66 AC 338 ms
49,860 KB
testcase_67 AC 316 ms
51,764 KB
testcase_68 AC 254 ms
50,156 KB
testcase_69 AC 259 ms
51,236 KB
testcase_70 AC 325 ms
50,916 KB
testcase_71 AC 296 ms
51,884 KB
testcase_72 AC 365 ms
49,580 KB
testcase_73 AC 306 ms
50,024 KB
testcase_74 AC 372 ms
51,528 KB
testcase_75 AC 327 ms
49,628 KB
testcase_76 AC 289 ms
49,304 KB
testcase_77 AC 319 ms
53,780 KB
testcase_78 AC 374 ms
49,904 KB
testcase_79 AC 438 ms
51,340 KB
testcase_80 AC 372 ms
50,652 KB
testcase_81 AC 317 ms
51,104 KB
testcase_82 AC 331 ms
49,700 KB
testcase_83 AC 382 ms
50,312 KB
testcase_84 AC 300 ms
50,928 KB
testcase_85 AC 359 ms
50,024 KB
testcase_86 AC 400 ms
49,816 KB
testcase_87 AC 282 ms
51,576 KB
testcase_88 AC 317 ms
52,124 KB
testcase_89 AC 391 ms
50,236 KB
testcase_90 AC 310 ms
49,496 KB
testcase_91 AC 305 ms
47,856 KB
testcase_92 AC 361 ms
52,268 KB
testcase_93 AC 343 ms
53,884 KB
testcase_94 AC 244 ms
51,764 KB
testcase_95 AC 321 ms
48,128 KB
testcase_96 AC 414 ms
51,224 KB
testcase_97 AC 354 ms
50,288 KB
testcase_98 AC 366 ms
48,108 KB
testcase_99 AC 379 ms
50,800 KB
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
  Determining projects to restore...
  Restored /home/judge/data/code/main.csproj (in 122 ms).
.NET 向け Microsoft (R) Build Engine バージョン 17.0.0-preview-21470-01+cb055d28f
Copyright (C) Microsoft Corporation.All rights reserved.

  プレビュー版の .NET を使用しています。https://aka.ms/dotnet-core-preview をご覧ください
  main -> /home/judge/data/code/bin/Release/net6.0/main.dll
  main -> /home/judge/data/code/bin/Release/net6.0/publish/

ソースコード

diff # 

using System;
using System.ComponentModel;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Runtime.Intrinsics.X86;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using static Functions;
using static OutputLib;

static class Program
{
    static public void Main(string[] args)
    {
        Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        new Solver();
        Console.Out.Flush();
    }
}

public class Solver
{
    public Solver()
    {
        Solve();
    }

    const int width = 25;
    const int height = 60;
    const int max_turn = 1000;

    void Solve()
    {
        var rnd = new Random();
        var enemy = new (long health, long power, long point)[width, height];
        for (int i = 0; i < width; i++)
            for (int j = 0; j < height; j++)
                enemy[i, j] = (0, 0, 0);

        int player_pos = 12;
        long score = 0;
        long power_sum = 0;

        var move_deque = new Deque<int>();

        int turn = 0;
        for (; turn < max_turn; turn++)
        {

            long level = 1 + power_sum / 100;

            for (int i = 0; i < width; i++)
            {
                for (int j = 0; j + 1 < height; j++)
                    enemy[i, j] = enemy[i, j + 1];
                enemy[i, height - 1] = (0, 0, 0);
            }

            {
                int n = ri;
                if (n == -1) break;

                for (int i = 0; i < n; i++)
                {
                    int h = ri, p = ri, x = ri;
                    enemy[x, height - 1] = (h, p, h);
                }
            }

            {
                if (move_deque.Count == 0)
                {
                    int period = 10;

                    var dp = new long[width, period + 1, height + 1];
                    var dppower = new long[width, period + 1, height + 1];
                    var from = new (int, int, int)[width, period + 1, height + 1];
                    for (int i = 0; i < width; i++)
                        for (int j = 0; j <= period; j++)
                            for (int k = 0; k <= height; k++)
                            {
                                dp[i, j, k] = -INF;
                                dppower[i, j, k] = -INF;
                                from[i, j, k] = (-1, -1, -1);
                            }
                    {
                        int k = 0;
                        while (k < height && enemy[player_pos, k].health == 0) k++;
                        dp[player_pos, 0, k] = 0;
                        dppower[player_pos, 0, k] = power_sum;
                    }
                    for (int k = 1; k <= height; k++)
                    {
                        for (int time = 0; time < period; time++)
                        {
                            for (int x = 0; x < width; x++)
                            {
                                if (dp[x, time, k] < 0) continue;
                                long lvl = 1 + dppower[x, time, k] / 100;

                                if (k < height && enemy[x, k].health <= (k - time) * lvl)
                                {
                                    int nk = k + 1;
                                    while (nk < height && enemy[x, nk].health == 0) nk++;
                                    long nt = time + Ceil(enemy[x, k].health, lvl);
                                    if (nt > period) continue;
                                    long v = dp[x, time, k] + enemy[x, k].point;
                                    if (dp[x, nt, nk] < v)
                                    {
                                        dp[x, nt, nk] = v;
                                        dppower[x, nt, nk] = dppower[x, nt, nk];
                                        from[x, nt, nk] = (x, time, k);
                                    }
                                }

                                for (int d = -1; d <= 1; d++)
                                {
                                    int y = SafeMod(x + d, width);
                                    if (x == y)
                                    {
                                        if (k == time)
                                        {
                                            if (enemy[y, time].health > 0) continue;
                                            if (enemy[y, time + 1].health > lvl) continue;
                                        }
                                        if (k == time + 1)
                                        {
                                            if (enemy[y, time + 1].health > lvl) continue;
                                        }
                                    }
                                    else
                                    {
                                        if (enemy[y, time].health > 0) continue;
                                        if (enemy[y, time + 1].health > lvl) continue;
                                    }
                                    int nk = x == y ? k : time;
                                    while (nk < height && enemy[y, nk].health == 0) nk++;
                                    if (dp[y, time + 1, nk] < dp[x, time, k])
                                    {
                                        dp[y, time + 1, nk] = dp[x, time, k];
                                        dppower[y, time + 1, nk] = dppower[x, time, k];
                                        from[y, time + 1, nk] = (x, time, k);
                                    }
                                }
                            }
                        }
                    }

                    int max_pos = player_pos, max_enemy = height;
                    for (int k = height; k >= 0; k--)
                        for (int i = 0; i < width; i++)
                            if (dp[i, period, k] > dp[max_pos, period, max_enemy])
                            {
                                max_pos = i;
                                max_enemy = k;
                            }

                    {
                        int x = max_pos;
                        int t = period;
                        int k = max_enemy;
                        while (x != -1)
                        {
                            var prv = from[x, t, k];
                            for (int d = -1; d <= 1; d++)
                            {
                                if (SafeMod(prv.Item1 + d, width) == x)
                                {
                                    for (int i = t - prv.Item2; i > 0; i--)
                                        move_deque.PushFront(d);
                                    break;
                                }
                            }
                            (x, t, k) = prv;
                        }
                    }
                }

                int move = 0;
                if (move_deque.Count > 0) move = move_deque.PopFront();
                else Write("# :(");

                {
                    int next_pos = SafeMod(player_pos + move, width);
                    if (enemy[next_pos, 0].health > 0 || enemy[next_pos, 1].health > level)
                    {
                        for (int d = -1; d <= 1; d++)
                        {
                            int y = SafeMod(player_pos + d, width);
                            if (enemy[y, 0].health == 0 && enemy[y, 1].health <= level)
                            {
                                move = d;
                                Write($"# dodge time: {turn} pos: {player_pos} -> {y}");
                                break;
                            }
                        }
                    }
                }

                if (move == -1) WriteFlush("L");
                if (move == 0) WriteFlush("S");
                if (move == 1) WriteFlush("R");
                player_pos = SafeMod(player_pos + move, width);
            }

            if (enemy[player_pos, 0].health > 0)
            {
                Write($"# crash time: {turn} pos: {player_pos}");
                break;
            }

            for (int i = 0; i < height; i++)
            {
                if (enemy[player_pos, i].health > 0)
                {
                    var (h, p, pt) = enemy[player_pos, i];
                    if (h <= level)
                    {
                        power_sum += p;
                        score += pt;
                        Write($"# defeat time: {turn} pos: {player_pos} point: {pt} score: {score}");
                        h = 0;
                        p = 0;
                        pt = 0;
                    }
                    else
                    {
                        h -= level;
                    }
                    enemy[player_pos, i] = (h, p, pt);
                    break;
                }
            }
        }
        WriteError($"Turn: {turn}, Score: {score}");
    }

    const long INF = 1L << 60;
    int ri { [MethodImpl(256)] get => (int)sc.Integer(); }
    long rl { [MethodImpl(256)] get => sc.Integer(); }
    uint rui { [MethodImpl(256)] get => (uint)sc.UInteger(); }
    ulong rul { [MethodImpl(256)] get => sc.UInteger(); }
    double rd { [MethodImpl(256)] get => sc.Double(); }
    string rs { [MethodImpl(256)] get => sc.Scan(); }
    string rline { [MethodImpl(256)] get => sc.Line(); }
    public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
}

public static class Functions
{
    [MethodImpl(256)]
    public static int Popcount(ulong x)
    {
        x = (x & 0x5555555555555555UL) + ((x >> 1) & 0x5555555555555555UL);
        x = (x & 0x3333333333333333UL) + ((x >> 2) & 0x3333333333333333UL);
        x = (x & 0x0f0f0f0f0f0f0f0fUL) + ((x >> 4) & 0x0f0f0f0f0f0f0f0fUL);
        x = (x & 0x00ff00ff00ff00ffUL) + ((x >> 8) & 0x00ff00ff00ff00ffUL);
        x = (x & 0x0000ffff0000ffffUL) + ((x >> 16) & 0x0000ffff0000ffffUL);
        x = (x & 0x00000000ffffffffUL) + ((x >> 32) & 0x00000000ffffffffUL);
        return (int)x;
    }
    [MethodImpl(256)]
    public static int Popcount(int x)
    {
        x = (x & 0x55555555) + ((x >> 1) & 0x55555555);
        x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
        x = (x & 0x0f0f0f0f) + ((x >> 4) & 0x0f0f0f0f);
        x = (x & 0x00ff00ff) + ((x >> 8) & 0x00ff00ff);
        x = (x & 0x0000ffff) + ((x >> 16) & 0x0000ffff);
        return x;
    }
    [MethodImpl(256)]
    public static int Ctz(long x)
    {
        if (x == 0) return -1;
        return Popcount((ulong)((x & -x) - 1));
    }
    [MethodImpl(256)]
    public static int CeilPow2(int n)
    {
        int x = 0;
        while ((1 << x) < n) x++;
        return x;
    }
    [MethodImpl(256)]
    public static int SafeMod(int x, int m)
    {
        int r = x % m;
        return r < 0 ? r + Math.Abs(m) : r;
    }
    [MethodImpl(256)]
    public static long SafeMod(long x, long m)
    {
        long r = x % m;
        return r < 0 ? r + Math.Abs(m) : r;
    }
    [MethodImpl(256)] public static int Sign(long x) => x == 0 ? 0 : (x < 0 ? -1 : 1);
    [MethodImpl(256)] public static int Sign(double x) => x == 0 ? 0 : (x < 0 ? -1 : 1);
    [MethodImpl(256)] public static int DigitSum(long n, int d = 10) { long s = 0; while (n > 0) { s += n % d; n /= d; } return (int)s; }
    [MethodImpl(256)] public static long Floor(long a, long b) => a >= 0 ? a / b : (a + 1) / b - 1;
    [MethodImpl(256)] public static long Ceil(long a, long b) => a > 0 ? (a - 1) / b + 1 : a / b;
    [MethodImpl(256)] public static int Gcd(int a, int b) => b == 0 ? a : Gcd(b, a % b);
    [MethodImpl(256)] public static long Gcd(long a, long b) => b == 0 ? a : Gcd(b, a % b);
    [MethodImpl(256)] public static void Swap(ref int x, ref int y) { x ^= y; y ^= x; x ^= y; }
    [MethodImpl(256)] public static void Swap(ref long x, ref long y) { x ^= y; y ^= x; x ^= y; }
    [MethodImpl(256)] public static void Swap<T>(ref T x, ref T y) { T t = y; y = x; x = t; }
    [MethodImpl(256)] public static T Clamp<T>(T x, T l, T r) where T : IComparable<T> => x.CompareTo(l) <= 0 ? l : (x.CompareTo(r) <= 0 ? x : r);
    [MethodImpl(256)] public static T Clamp<T>(ref T x, T l, T r) where T : IComparable<T> => x = x.CompareTo(l) <= 0 ? l : (x.CompareTo(r) <= 0 ? x : r);
    [MethodImpl(256)] public static void Chmin<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) > 0) x = y; }
    [MethodImpl(256)] public static void Chmax<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) < 0) x = y; }
    public static int LowerBound(long[] arr, long val, int l = -1, int r = -1) => LowerBound<long>(arr.AsSpan(), t => Sign(t - val), l, r);
    public static int LowerBound(int[] arr, int val, int l = -1, int r = -1) => LowerBound<int>(arr.AsSpan(), t => t - val, l, r);
    public static int LowerBound<T>(T[] arr, Func<T, int> comp, int l = -1, int r = -1) => LowerBound<T>(arr.AsSpan<T>(), comp, l, r);
    public static int LowerBound<T>(Span<T> data, Func<T, int> comp, int l = -1, int r = -1)
    {
        if (data.Length == 0) return -1;
        if (l == -1) l = 0;
        if (r == -1) r = data.Length;
        while (l < r)
        {
            int x = (l + r) / 2;
            if (comp(data[x]) < 0) l = x + 1;
            else r = x;
        }
        return l;
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string ToBase2(long v, int digit = -1)
    {
        if (digit == -1)
        {
            digit = 0;
            while ((v >> digit) > 0) digit++;
        }
        var c = new string[digit];
        for (int i = 0; i < digit; i++) c[digit - 1 - i] = ((v >> i) & 1) == 0 ? "0" : "1";
        return string.Join("", c);
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string ToBaseN(long v, int n, int digit = -1)
    {
        if (digit == -1)
        {
            digit = 0;
            long pow = 1;
            while (v >= pow) { digit++; pow *= n; }
        }
        var c = new int[digit];
        for (int i = 0; i < digit; i++, v /= n) c[digit - 1 - i] = (int)(v % n);
        return string.Join("", c);
    }
}

public class StreamScanner
{
    public StreamScanner(Stream stream) { str = stream; }
    private readonly Stream str;
    private readonly byte[] buf = new byte[1024];
    private int len, ptr;
    public bool isEof = false;
    public bool IsEndOfStream { get { return isEof; } }
    [MethodImpl(256)]
    private byte read()
    {
        if (isEof) throw new EndOfStreamException();
        if (ptr >= len)
        {
            ptr = 0;
            if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; }
        }
        return buf[ptr++];
    }
    [MethodImpl(256)]
    public char Char()
    {
        byte b = 0;
        do b = read();
        while (b < 33 || 126 < b);
        return (char)b;
    }
    [MethodImpl(256)]
    public string Line()
    {
        var sb = new StringBuilder();
        for (var b = Char(); b != 10 && !isEof; b = (char)read()) sb.Append(b);
        return sb.ToString();
    }
    [MethodImpl(256)]
    public string Scan()
    {
        var sb = new StringBuilder();
        for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b);
        return sb.ToString();
    }
    [MethodImpl(256)]
    public long Integer()
    {
        long ret = 0; byte b = 0; var ng = false;
        do b = read();
        while (b != '-' && (b < '0' || '9' < b));
        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';
        }
    }
    [MethodImpl(256)]
    public ulong UInteger()
    {
        ulong ret = 0; byte b = 0;
        do b = read();
        while (b < '0' || '9' < b);
        for (; true; b = read())
        {
            if (b < '0' || '9' < b) return ret;
            else ret = ret * 10 + b - '0';
        }
    }
    [MethodImpl(256)]
    public double Double() => double.Parse(Scan());
}

public static class OutputLib
{
    [MethodImpl(256)] public static void WriteJoin<T>(string s, IEnumerable<T> t) => Console.WriteLine(string.Join(s, t));
    [MethodImpl(256)]
    public static void WriteMat<T>(T[,] a)
    {
        int sz1 = a.GetLength(0);
        int sz2 = a.GetLength(1);
        for (int i = 0; i < sz1; i++)
        {
            var b = new T[sz2];
            for (int j = 0; j < sz2; j++) b[j] = a[i, j];
            WriteJoin(" ", b);
        }
    }
    [MethodImpl(256)] public static void WriteMat<T>(T[][] a) { for (int i = 0; i < a.Length; i++) WriteJoin(" ", a[i]); }
    [MethodImpl(256)] public static void Write(object t) => Console.WriteLine(t.ToString());
    [MethodImpl(256)] public static void Write(string str) => Console.WriteLine(str);
    [MethodImpl(256)] public static void Write(string str, object arg1) => Console.WriteLine(str, arg1);
    [MethodImpl(256)] public static void Write(string str, object arg1, object arg2) => Console.WriteLine(str, arg1, arg2);
    [MethodImpl(256)] public static void Write(string str, object arg1, object arg2, object arg3) => Console.WriteLine(str, arg1, arg2, arg3);
    [MethodImpl(256)] public static void Write(string str, params object[] arg) => Console.WriteLine(str, arg);
    [MethodImpl(256)] public static void WriteFlush(object t) { Console.WriteLine(t.ToString()); Console.Out.Flush(); }
    [MethodImpl(256)] public static void WriteError(object t) => Console.Error.WriteLine(t.ToString());
    [MethodImpl(256)] public static void Flush() => Console.Out.Flush();
    [MethodImpl(256)] public static void YN(bool t) => Console.WriteLine(t ? "YES" : "NO");
    [MethodImpl(256)] public static void Yn(bool t) => Console.WriteLine(t ? "Yes" : "No");
    [MethodImpl(256)] public static void yn(bool t) => Console.WriteLine(t ? "yes" : "no");
}

public class Deque<T>
{
    class Node
    {
        public Node Prev, Next;
        public T Value;
        public Node(T v)
        {
            Value = v;
            Prev = null;
            Next = null;
        }
    }
    public int Count { get; private set; }
    Node Front, Back;
    public Deque() { }
    [MethodImpl(256)]
    public void PushBack(T v)
    {
        Node x = new Node(v);
        if (Count == 0)
        {
            Front = x;
            Back = x;
        }
        else
        {
            Back.Next = x;
            x.Prev = Back;
            Back = x;
        }
        Count++;
    }
    [MethodImpl(256)]
    public void PushFront(T v)
    {
        Node x = new Node(v);
        if (Count == 0)
        {
            Front = x;
            Back = x;
        }
        else
        {
            Front.Prev = x;
            x.Next = Front;
            Front = x;
        }
        Count++;
    }
    [MethodImpl(256)]
    public T PopBack()
    {
        if (Count == 0) throw new InvalidOperationException("Deque empty.");
        T v = Back.Value;
        Count--;
        if (Count == 0)
        {
            Front = null;
            Back = null;
        }
        else
        {
            Back = Back.Prev;
        }
        return v;
    }
    [MethodImpl(256)]
    public T PopFront()
    {
        if (Count == 0) throw new InvalidOperationException("Deque empty.");
        T v = Front.Value;
        Count--;
        if (Count == 0)
        {
            Front = null;
            Back = null;
        }
        else
        {
            Front = Front.Next;
        }
        return v;
    }
    [MethodImpl(256)]
    public T PeekBack()
    {
        if (Count == 0) throw new InvalidOperationException("Deque empty.");
        return Back.Value;
    }
    [MethodImpl(256)]
    public T PeekFront()
    {
        if (Count == 0) throw new InvalidOperationException("Deque empty.");
        return Front.Value;
    }
}
0