Added solution for "Day 22: Sand Slabs", part 1
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@ -125,6 +125,10 @@
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<Filename Value="solvers\UStepCounter.pas"/>
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<IsPartOfProject Value="True"/>
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</Unit>
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<Unit>
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<Filename Value="solvers\USandSlabs.pas"/>
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<IsPartOfProject Value="True"/>
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</Unit>
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</Units>
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</ProjectOptions>
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<CompilerOptions>
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@ -27,7 +27,7 @@ uses
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UTrebuchet, UCubeConundrum, UGearRatios, UScratchcards, UGiveSeedFertilizer, UWaitForIt, UCamelCards,
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UHauntedWasteland, UNumberTheory, UMirageMaintenance, UPipeMaze, UCosmicExpansion, UHotSprings, UPointOfIncidence,
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UParabolicReflectorDish, ULensLibrary, UFloorWillBeLava, UClumsyCrucible, ULavaductLagoon, UAplenty,
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UPulsePropagation, UStepCounter;
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UPulsePropagation, UStepCounter, USandSlabs;
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type
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@ -90,6 +90,7 @@ begin
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19: engine.RunAndFree(TAplenty.Create);
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20: engine.RunAndFree(TPulsePropagation.Create);
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21: engine.RunAndFree(TStepCounter.Create);
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22: engine.RunAndFree(TSandSlabs.Create);
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end;
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engine.Free;
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@ -0,0 +1,218 @@
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{
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Solutions to the Advent Of Code.
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Copyright (C) 2023 Stefan Müller
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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}
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unit USandSlabs;
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{$mode ObjFPC}{$H+}
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interface
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uses
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Classes, SysUtils, Generics.Collections, Generics.Defaults, USolver;
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const
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CGroundSize = 10;
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type
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{ TBrick }
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TBrick = class
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private
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FX1, FY1, FZ1, FX2, FY2, FZ2: Integer;
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FIsDisintegratable: Boolean;
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public
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property X1: Integer read FX1;
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property Y1: Integer read FY1;
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property Z1: Integer read FZ1;
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property X2: Integer read FX2;
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property Y2: Integer read FY2;
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property Z2: Integer read FZ2;
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property IsDisintegratable: Boolean read FIsDisintegratable write FIsDisintegratable;
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constructor Create(const AX1, AY1, AZ1, AX2, AY2, AZ2: Integer);
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constructor Create(const ALine: string);
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procedure SetZ1(const AValue: Integer);
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end;
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{ TBrickComparer }
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TBrickComparer = class(TInterfacedObject, specialize IComparer<TBrick>)
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public
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function Compare(constref ALeft, ARight: TBrick): Integer; overload;
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end;
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TBricks = specialize TObjectList<TBrick>;
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{ TGroundTile }
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TGroundTile = record
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Height: Integer;
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TopBrick: TBrick;
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end;
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TGround = array[0..CGroundSize - 1, 0.. CGroundSize - 1] of TGroundTile;
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{ TSandSlabs }
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TSandSlabs = class(TSolver)
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private
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FBricks: TBricks;
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FGround: TGround;
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procedure InitGround;
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procedure StackBrick(const ABrick: TBrick);
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public
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constructor Create;
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destructor Destroy; override;
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procedure ProcessDataLine(const ALine: string); override;
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procedure Finish; override;
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function GetDataFileName: string; override;
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function GetPuzzleName: string; override;
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end;
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implementation
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{ TBrick }
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constructor TBrick.Create(const AX1, AY1, AZ1, AX2, AY2, AZ2: Integer);
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begin
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FX1 := AX1;
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FY1 := AY1;
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FZ1 := AZ1;
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FX2 := AX2;
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FY2 := AY2;
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FZ2 := AZ2;
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FIsDisintegratable := True;
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end;
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constructor TBrick.Create(const ALine: string);
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var
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split: TStringArray;
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begin
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split := ALine.Split([',', '~']);
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Create(StrToInt(split[0]), StrToInt(split[1]), StrToInt(split[2]), StrToInt(split[3]), StrToInt(split[4]),
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StrToInt(split[5]));
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end;
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procedure TBrick.SetZ1(const AValue: Integer);
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begin
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Inc(FZ2, AValue - FZ1);
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FZ1 := AValue;
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end;
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{ TBrickComparer }
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function TBrickComparer.Compare(constref ALeft, ARight: TBrick): Integer;
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begin
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Result := ALeft.FZ1 - ARight.FZ1;
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end;
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{ TSandSlabs }
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procedure TSandSlabs.InitGround;
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var
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i, j: Integer;
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begin
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for i := 0 to CGroundSize - 1 do
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for j := 0 to CGroundSize - 1 do
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begin
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FGround[i, j].Height := 0;
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FGround[i, j].TopBrick := nil;
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end;
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end;
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procedure TSandSlabs.StackBrick(const ABrick: TBrick);
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var
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supports: TBricks;
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i, j, max: Integer;
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begin
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Inc(FPart1);
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// Checks height and supports for this brick.
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supports := TBricks.Create(False);
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max := 0;
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for i := ABrick.X1 to ABrick.X2 do
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for j := ABrick.Y1 to ABrick.Y2 do
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if max <= FGround[i, j].Height then
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begin
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if max < FGround[i, j].Height then
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begin
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max := FGround[i, j].Height;
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supports.Clear;
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end;
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if (FGround[i, j].TopBrick <> nil) and not supports.Contains(FGround[i, j].TopBrick) then
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supports.Add(FGround[i, j].TopBrick);
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end;
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// Updates disintegration flag.
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if supports.Count = 1 then
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begin
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if supports[0].IsDisintegratable then
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begin
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supports[0].IsDisintegratable := False;
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Dec(FPart1);
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end;
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end;
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supports.Free;
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// Adjusts height and write brick to ground.
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ABrick.SetZ1(max + 1);
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for i := ABrick.X1 to ABrick.X2 do
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for j := ABrick.Y1 to ABrick.Y2 do
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begin
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FGround[i, j].Height := ABrick.Z2;
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FGround[i, j].TopBrick := ABrick;
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end;
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end;
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constructor TSandSlabs.Create;
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begin
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FBricks := TBricks.Create(TBrickComparer.Create);
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end;
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destructor TSandSlabs.Destroy;
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begin
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FBricks.Free;
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inherited Destroy;
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end;
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procedure TSandSlabs.ProcessDataLine(const ALine: string);
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begin
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FBricks.Add(TBrick.Create(ALine));
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end;
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procedure TSandSlabs.Finish;
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var
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brick: TBrick;
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begin
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FBricks.Sort;
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InitGround;
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for brick in FBricks do
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StackBrick(brick);
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end;
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function TSandSlabs.GetDataFileName: string;
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begin
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Result := 'sand_slabs.txt';
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end;
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function TSandSlabs.GetPuzzleName: string;
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begin
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Result := 'Day 22: Sand Slabs';
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end;
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end.
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@ -128,6 +128,10 @@
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<Filename Value="UStepCounterTestCases.pas"/>
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<IsPartOfProject Value="True"/>
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</Unit>
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<Unit>
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<Filename Value="USandSlabsTestCases.pas"/>
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<IsPartOfProject Value="True"/>
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</Unit>
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</Units>
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</ProjectOptions>
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<CompilerOptions>
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@ -8,7 +8,7 @@ uses
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UHauntedWastelandTestCases, UMirageMaintenanceTestCases, UPipeMazeTestCases, UCosmicExpansionTestCases,
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UHotSpringsTestCases, UPointOfIncidenceTestCases, UParabolicReflectorDishTestCases, ULensLibraryTestCases,
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UFloorWillBeLavaTestCases, UClumsyCrucibleTestCases, ULavaductLagoonTestCases, UAplentyTestCases,
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UPulsePropagationTestCases, UStepCounterTestCases;
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UPulsePropagationTestCases, UStepCounterTestCases, USandSlabsTestCases;
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{$R *.res}
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@ -0,0 +1,78 @@
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{
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Solutions to the Advent Of Code.
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Copyright (C) 2023 Stefan Müller
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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}
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unit USandSlabsTestCases;
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{$mode ObjFPC}{$H+}
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interface
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uses
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Classes, SysUtils, fpcunit, testregistry, USolver, UBaseTestCases, USandSlabs;
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type
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{ TSandSlabsFullDataTestCase }
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TSandSlabsFullDataTestCase = class(TEngineBaseTest)
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protected
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function CreateSolver: ISolver; override;
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published
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procedure TestPart1;
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end;
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{ TSandSlabsExampleTestCase }
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TSandSlabsExampleTestCase = class(TExampleEngineBaseTest)
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protected
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function CreateSolver: ISolver; override;
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published
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procedure TestPart1;
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end;
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implementation
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{ TSandSlabsFullDataTestCase }
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function TSandSlabsFullDataTestCase.CreateSolver: ISolver;
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begin
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Result := TSandSlabs.Create;
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end;
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procedure TSandSlabsFullDataTestCase.TestPart1;
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begin
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AssertEquals(389, FSolver.GetResultPart1);
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end;
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{ TSandSlabsExampleTestCase }
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function TSandSlabsExampleTestCase.CreateSolver: ISolver;
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begin
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Result := TSandSlabs.Create;
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end;
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procedure TSandSlabsExampleTestCase.TestPart1;
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begin
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AssertEquals(5, FSolver.GetResultPart1);
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end;
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initialization
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RegisterTest(TSandSlabsFullDataTestCase);
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RegisterTest(TSandSlabsExampleTestCase);
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end.
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