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20-053 Lキューブ

問題

小田原充宏さんのLキューブを解きます。

9つのピースは下記となります。
各ピースは回転や裏返しても使えます。


問題1 3×3×3


ソース

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    //ピースごとの配置候補
    static Dictionary<char, List<bool[, ,]>> HaitiKouhoListDict =
        new Dictionary<char, List<bool[, ,]>>();

    static char[] PieceNameArr = "123456789".ToCharArray();

    static int UB = 2;

    struct JyoutaiDef
    {
        internal char[, ,] BanArr;
        internal int CurrX;
        internal int CurrY;
        internal int CurrZ;
        internal int PieceCnt;
    }

    static void Main()
    {
        foreach (char EachPiece in PieceNameArr) {
            HaitiKouhoListDict[EachPiece] = DeriveHaitiKouhoList();
        }

        var Stk = new Stack<JyoutaiDef>();
        JyoutaiDef WillPush;

        WillPush.BanArr = new char[UB + 1, UB + 1, UB + 1];
        for (int X = 0; X <= UB; X++)
            for (int Y = 0; Y <= UB; Y++)
                for (int Z = 0; Z <= UB; Z++)
                    WillPush.BanArr[X, Y, Z] = ' ';

        WillPush.CurrX = WillPush.CurrY = WillPush.CurrZ = 0;
        WillPush.PieceCnt = 0;
        Stk.Push(WillPush);

        while (Stk.Count > 0) {
            JyoutaiDef Popped = Stk.Pop();

            //クリア判定
            if (Popped.PieceCnt == 9) {
                Console.WriteLine("解を発見");
                PrintBan(Popped.BanArr);
                break;
            }

            //X座標の繰上げ処理
            if (Popped.CurrX > UB) {
                Popped.CurrX = 0;
                Popped.CurrY++;
            }

            //最終行を超えた場合
            if (Popped.CurrY > UB) {
                Popped.CurrY = 0;

                //最終高さを超えた場合
                if (++Popped.CurrZ > UB) continue;
            }

            //使用済のピース名の配列
            char[] UsedPieceArr = Popped.BanArr.Cast<char>().Distinct().ToArray();

            foreach (char EachPiece in PieceNameArr) {
                if (Array.IndexOf(UsedPieceArr, EachPiece) >= 0) continue;

                //回転解の除外
                if (EachPiece == '1') {
                    if (Popped.CurrX > UB / 2) continue;
                    if (Popped.CurrY > UB / 2) continue;
                    if (Popped.CurrZ > UB / 2) continue;
                }

                //ピースの配置候補リスト
                List<bool[, ,]> HaitiKouhoList = new List<bool[, ,]>();
                HaitiKouhoList.AddRange(HaitiKouhoListDict[EachPiece]);

                Func<bool> IsNGFunc = () =>
                {
                    for (char I = '2'; I <= '9'; I++) {
                        if (EachPiece != I) continue;
                        for (char J = '1'; J <= I - 1; J++) {
                            if (Array.IndexOf(UsedPieceArr, J) == -1) return true;
                        }
                    }
                    return false;
                };
                if (IsNGFunc()) continue;

                //現在のマス目が空白の場合は、マス目を埋める必要あり
                if (Popped.BanArr[Popped.CurrX, Popped.CurrY, Popped.CurrZ] == ' ') {
                    HaitiKouhoList.RemoveAll(X => X[0, 0, 0] == false);
                }

                //マス目にピースを埋めれない候補をRemove
                HaitiKouhoList.RemoveAll(X =>
                    CanFillPiece(X, Popped.CurrX, Popped.CurrY, Popped.CurrZ, Popped.BanArr) == false);

                //ピースを配置する経路のPush処理
                foreach (bool[, ,] EachPieceMap in HaitiKouhoList) {
                    WillPush.BanArr = (char[, ,])Popped.BanArr.Clone();
                    WillPush.CurrX = Popped.CurrX;
                    WillPush.CurrY = Popped.CurrY;
                    WillPush.CurrZ = Popped.CurrZ;
                    WillPush.PieceCnt = Popped.PieceCnt + 1;

                    for (int X = 0; X <= EachPieceMap.GetUpperBound(0); X++) {
                        for (int Y = 0; Y <= EachPieceMap.GetUpperBound(1); Y++) {
                            for (int Z = 0; Z <= EachPieceMap.GetUpperBound(2); Z++) {
                                if (EachPieceMap[X, Y, Z] == false) continue;
                                WillPush.BanArr[Popped.CurrX + X, Popped.CurrY + Y, Popped.CurrZ + Z]
                                    = EachPiece;
                            }
                        }
                    }
                    Stk.Push(WillPush);
                }
            }

            //現在のマス目が空白でない場合は、ピースを配置しない経路のPush
            if (Popped.BanArr[Popped.CurrX, Popped.CurrY, Popped.CurrZ] != ' ') {
                WillPush.BanArr = Popped.BanArr;
                WillPush.CurrX = Popped.CurrX + 1;
                WillPush.CurrY = Popped.CurrY;
                WillPush.CurrZ = Popped.CurrZ;
                WillPush.PieceCnt = Popped.PieceCnt;
                Stk.Push(WillPush);
            }
        }
    }

    //回転させた配置のListを返す
    static List<bool[, ,]> DeriveHaitiKouhoList()
    {
        bool[, ,] wkArr = null;

        Action<int, int> SetAct = (pX, pY) => wkArr[pX, pY, 0] = true;

        //■
        //■■
        wkArr = new bool[2, 2, 1];
        SetAct(0, 0);
        SetAct(0, 1); SetAct(1, 1);

        return DeriveKaitenArrList(wkArr);
    }

    //配列を引数として、回転させた配列のリストをDistinctして返す
    static List<bool[, ,]> DeriveKaitenArrList(bool[, ,] pBaseArr)
    {
        var KaitenArrList = new List<bool[, ,]>();

        int BaseUB_X = pBaseArr.GetUpperBound(0);
        int BaseUB_Y = pBaseArr.GetUpperBound(1);
        int BaseUB_Z = pBaseArr.GetUpperBound(2);

        for (int I = 1; I <= 48; I++) KaitenArrList.Add(null);
        for (int P = 0; P <= 7; P++) KaitenArrList[P] = new bool[BaseUB_X + 1, BaseUB_Y + 1, BaseUB_Z + 1];
        for (int P = 8; P <= 15; P++) KaitenArrList[P] = new bool[BaseUB_X + 1, BaseUB_Z + 1, BaseUB_Y + 1];
        for (int P = 16; P <= 23; P++) KaitenArrList[P] = new bool[BaseUB_Y + 1, BaseUB_X + 1, BaseUB_Z + 1];
        for (int P = 24; P <= 31; P++) KaitenArrList[P] = new bool[BaseUB_Y + 1, BaseUB_Z + 1, BaseUB_X + 1];
        for (int P = 32; P <= 39; P++) KaitenArrList[P] = new bool[BaseUB_Z + 1, BaseUB_X + 1, BaseUB_Y + 1];
        for (int P = 40; P <= 47; P++) KaitenArrList[P] = new bool[BaseUB_Z + 1, BaseUB_Y + 1, BaseUB_X + 1];

        for (int X = 0; X <= BaseUB_X; X++) {
            for (int Y = 0; Y <= BaseUB_Y; Y++) {
                for (int Z = 0; Z <= BaseUB_Z; Z++) {
                    bool SetVal = pBaseArr[X, Y, Z];
                    KaitenArrList[0][X, Y, Z] = SetVal;
                    KaitenArrList[1][X, Y, BaseUB_Z - Z] = SetVal;
                    KaitenArrList[2][X, BaseUB_Y - Y, Z] = SetVal;
                    KaitenArrList[3][X, BaseUB_Y - Y, BaseUB_Z - Z] = SetVal;
                    KaitenArrList[4][BaseUB_X - X, Y, Z] = SetVal;
                    KaitenArrList[5][BaseUB_X - X, Y, BaseUB_Z - Z] = SetVal;
                    KaitenArrList[6][BaseUB_X - X, BaseUB_Y - Y, Z] = SetVal;
                    KaitenArrList[7][BaseUB_X - X, BaseUB_Y - Y, BaseUB_Z - Z] = SetVal;

                    KaitenArrList[8][X, Z, Y] = SetVal;
                    KaitenArrList[9][X, Z, BaseUB_Y - Y] = SetVal;
                    KaitenArrList[10][X, BaseUB_Z - Z, Y] = SetVal;
                    KaitenArrList[11][X, BaseUB_Z - Z, BaseUB_Y - Y] = SetVal;
                    KaitenArrList[12][BaseUB_X - X, Z, Y] = SetVal;
                    KaitenArrList[13][BaseUB_X - X, Z, BaseUB_Y - Y] = SetVal;
                    KaitenArrList[14][BaseUB_X - X, BaseUB_Z - Z, Y] = SetVal;
                    KaitenArrList[15][BaseUB_X - X, BaseUB_Z - Z, BaseUB_Y - Y] = SetVal;

                    KaitenArrList[16][Y, X, Z] = SetVal;
                    KaitenArrList[17][Y, X, BaseUB_Z - Z] = SetVal;
                    KaitenArrList[18][Y, BaseUB_X - X, Z] = SetVal;
                    KaitenArrList[19][Y, BaseUB_X - X, BaseUB_Z - Z] = SetVal;
                    KaitenArrList[20][BaseUB_Y - Y, X, Z] = SetVal;
                    KaitenArrList[21][BaseUB_Y - Y, X, BaseUB_Z - Z] = SetVal;
                    KaitenArrList[22][BaseUB_Y - Y, BaseUB_X - X, Z] = SetVal;
                    KaitenArrList[23][BaseUB_Y - Y, BaseUB_X - X, BaseUB_Z - Z] = SetVal;

                    KaitenArrList[24][Y, Z, X] = SetVal;
                    KaitenArrList[25][Y, Z, BaseUB_X - X] = SetVal;
                    KaitenArrList[26][Y, BaseUB_Z - Z, X] = SetVal;
                    KaitenArrList[27][Y, BaseUB_Z - Z, BaseUB_X - X] = SetVal;
                    KaitenArrList[28][BaseUB_Y - Y, Z, X] = SetVal;
                    KaitenArrList[29][BaseUB_Y - Y, Z, BaseUB_X - X] = SetVal;
                    KaitenArrList[30][BaseUB_Y - Y, BaseUB_Z - Z, X] = SetVal;
                    KaitenArrList[31][BaseUB_Y - Y, BaseUB_Z - Z, BaseUB_X - X] = SetVal;

                    KaitenArrList[32][Z, X, Y] = SetVal;
                    KaitenArrList[33][Z, X, BaseUB_Y - Y] = SetVal;
                    KaitenArrList[34][Z, BaseUB_X - X, Y] = SetVal;
                    KaitenArrList[35][Z, BaseUB_X - X, BaseUB_Y - Y] = SetVal;
                    KaitenArrList[36][BaseUB_Z - Z, X, Y] = SetVal;
                    KaitenArrList[37][BaseUB_Z - Z, X, BaseUB_Y - Y] = SetVal;
                    KaitenArrList[38][BaseUB_Z - Z, BaseUB_X - X, Y] = SetVal;
                    KaitenArrList[39][BaseUB_Z - Z, BaseUB_X - X, BaseUB_Y - Y] = SetVal;

                    KaitenArrList[40][Z, Y, X] = SetVal;
                    KaitenArrList[41][Z, Y, BaseUB_X - X] = SetVal;
                    KaitenArrList[42][Z, BaseUB_Y - Y, X] = SetVal;
                    KaitenArrList[43][Z, BaseUB_Y - Y, BaseUB_X - X] = SetVal;
                    KaitenArrList[44][BaseUB_Z - Z, Y, X] = SetVal;
                    KaitenArrList[45][BaseUB_Z - Z, Y, BaseUB_X - X] = SetVal;
                    KaitenArrList[46][BaseUB_Z - Z, BaseUB_Y - Y, X] = SetVal;
                    KaitenArrList[47][BaseUB_Z - Z, BaseUB_Y - Y, BaseUB_X - X] = SetVal;
                }
            }
        }

        //Distinctする
        for (int I = KaitenArrList.Count - 1; 0 <= I; I--) {
            for (int J = 0; J <= I - 1; J++) {
                //UBが違う場合は、同一でない
                if (KaitenArrList[I].GetUpperBound(0) != KaitenArrList[J].GetUpperBound(0)) continue;
                if (KaitenArrList[I].GetUpperBound(1) != KaitenArrList[J].GetUpperBound(1)) continue;
                if (KaitenArrList[I].GetUpperBound(2) != KaitenArrList[J].GetUpperBound(2)) continue;

                IEnumerable<bool> wkEnum1 = KaitenArrList[I].Cast<bool>();
                IEnumerable<bool> wkEnum2 = KaitenArrList[J].Cast<bool>();
                if (wkEnum1.SequenceEqual(wkEnum2) == false) continue;

                KaitenArrList.RemoveAt(I);
                break;
            }
        }
        return KaitenArrList;
    }

    //マス目にピースを埋めれるか
    static bool CanFillPiece(bool[, ,] pPieceMap,
        int pTargetX, int pTargetY, int pTargetZ, char[, ,] pBanArr)
    {
        if (pTargetX + pPieceMap.GetUpperBound(0) > UB) return false;
        if (pTargetY + pPieceMap.GetUpperBound(1) > UB) return false;
        if (pTargetZ + pPieceMap.GetUpperBound(2) > UB) return false;

        for (int X = 0; X <= pPieceMap.GetUpperBound(0); X++) {
            for (int Y = 0; Y <= pPieceMap.GetUpperBound(1); Y++) {
                for (int Z = 0; Z <= pPieceMap.GetUpperBound(2); Z++) {
                    if (pPieceMap[X, Y, Z]
                     && pBanArr[pTargetX + X, pTargetY + Y, pTargetZ + Z] != ' ')
                        return false;
                }
            }
        }
        return true;
    }

    //解を出力
    static void PrintBan(char[, ,] pBanArr)
    {
        var sb = new System.Text.StringBuilder();

        for (int Z = 0; Z <= UB; Z++) {
            sb.AppendFormat("Z={0}の平面", Z);
            sb.AppendLine();
            for (int Y = 0; Y <= UB; Y++) {
                for (int X = 0; X <= UB; X++) {
                    sb.Append(pBanArr[X, Y, Z]);
                }
                sb.AppendLine();
            }
        }
        Console.WriteLine(sb.ToString());
    }
}


実行結果

解を発見
Z=0の平面
123
123
445
Z=1の平面
667
123
455
Z=2の平面
677
889
899


解説

深さ優先探索でピースを敷き詰めてます。