Added solution for "Day 13: Point of Incidence", part 1

This commit is contained in:
Stefan Müller 2023-12-13 18:38:28 +01:00 committed by Stefan Müller
parent d32297782c
commit 6b888a3f68
6 changed files with 275 additions and 2 deletions

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@ -85,6 +85,10 @@
<Filename Value="solvers\UHotSprings.pas"/>
<IsPartOfProject Value="True"/>
</Unit>
<Unit>
<Filename Value="solvers\UPointOfIncidence.pas"/>
<IsPartOfProject Value="True"/>
</Unit>
</Units>
</ProjectOptions>
<CompilerOptions>

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@ -26,7 +26,7 @@ uses
Classes, SysUtils, CustApp,
USolver,
UTrebuchet, UCubeConundrum, UGearRatios, UScratchcards, UGiveSeedFertilizer, UWaitForIt, UCamelCards,
UHauntedWasteland, UNumberTheory, UMirageMaintenance, UPipeMaze, UCosmicExpansion, UHotSprings;
UHauntedWasteland, UNumberTheory, UMirageMaintenance, UPipeMaze, UCosmicExpansion, UHotSprings, UPointOfIncidence;
type
@ -63,6 +63,7 @@ begin
engine.RunAndFree(TPipeMaze.Create);
engine.RunAndFree(TCosmicExpansion.Create);
engine.RunAndFree(THotSprings.Create);
engine.RunAndFree(TPointOfIncidence.Create);
engine.Free;
end;

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@ -0,0 +1,186 @@
{
Solutions to the Advent Of Code.
Copyright (C) 2023 Stefan Müller
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
}
unit UPointOfIncidence;
{$mode ObjFPC}{$H+}
interface
uses
Classes, SysUtils, Generics.Collections, Math, USolver;
type
{ TPointOfIncidence }
TPointOfIncidence = class(TSolver)
private
FLines: TStringList;
FHorizontalMirrorCandidates, FVerticalMirrorCandidates: specialize TList<Integer>;
procedure ProcessPatternLine(const ALine: string);
procedure VerifyHorizontalCandidates(const ANewLine: string);
procedure CheckForNewHorizontalCandidate(const ANewLine: string);
procedure VerifyVerticalCandidates(const ALine: string);
procedure InitializeNewVerticalCandidates(const AFirstLine: string);
procedure FinishPattern;
public
constructor Create;
destructor Destroy; override;
procedure ProcessDataLine(const ALine: string); override;
procedure Finish; override;
function GetDataFileName: string; override;
function GetPuzzleName: string; override;
end;
implementation
{ TPointOfIncidence }
procedure TPointOfIncidence.ProcessPatternLine(const ALine: string);
begin
VerifyHorizontalCandidates(ALine);
CheckForNewHorizontalCandidate(ALine);
if FLines.Count > 0 then
VerifyVerticalCandidates(ALine)
else
InitializeNewVerticalCandidates(ALine);
FLines.Add(ALine);
end;
procedure TPointOfIncidence.VerifyHorizontalCandidates(const ANewLine: string);
var
i, mirroredIndex: Integer;
begin
// Checks if the current line fulfills the exisiting horizontal mirror candidates.
i := FHorizontalMirrorCandidates.Count - 1;
while i >= 0 do
begin
// Calculates the index of the line that the current line would be a duplicate of in regards to the i-th candidate.
mirroredIndex := 2 * FHorizontalMirrorCandidates[i] - FLines.Count - 1;
if (mirroredIndex >= 0) and (ANewLine <> FLines[mirroredIndex]) then
FHorizontalMirrorCandidates.Delete(i);
Dec(i);
end;
end;
procedure TPointOfIncidence.CheckForNewHorizontalCandidate(const ANewLine: string);
begin
// Checks for new horizontal mirror candidate between ALine and the previous line.
if (FLines.Count > 0) and (ANewLine = FLines[FLines.Count - 1]) then
FHorizontalMirrorCandidates.Add(FLines.Count);
end;
procedure TPointOfIncidence.VerifyVerticalCandidates(const ALine: string);
var
i, j, len, mirror: Integer;
begin
// Checks if the current line fulfills the exisiting vertical mirror candidates.
len := Length(ALine);
i := FVerticalMirrorCandidates.Count - 1;
while i >= 0 do
begin
mirror := FVerticalMirrorCandidates[i];
for j := 0 to Min(mirror - 1, len - mirror - 1) do
begin
if ALine[mirror - j] <> ALine[mirror + j + 1] then
begin
FVerticalMirrorCandidates.Delete(i);
Break;
end;
end;
Dec(i);
end;
end;
procedure TPointOfIncidence.InitializeNewVerticalCandidates(const AFirstLine: string);
var
i, j, len: Integer;
isMirror: Boolean;
begin
// Checks the line for vertical mirror candidates, i.e. mirrors that work for this line.
len := Length(AFirstLine);
for i := 1 to len - 1 do begin
isMirror := True;
for j := 0 to Min(i - 1, len - i - 1) do
begin
if AFirstLine[i - j] <> AFirstLine[i + j + 1] then
begin
isMirror := False;
Break;
end;
end;
if isMirror then
FVerticalMirrorCandidates.Add(i);
end;
end;
procedure TPointOfIncidence.FinishPattern;
var
i: Integer;
begin
for i := 0 to FHorizontalMirrorCandidates.Count - 1 do
Inc(FPart1, FHorizontalMirrorCandidates[i] * 100);
for i := 0 to FVerticalMirrorCandidates.Count - 1 do
Inc(FPart1, FVerticalMirrorCandidates[i]);
FLines.Clear;
FHorizontalMirrorCandidates.Clear;
FVerticalMirrorCandidates.Clear;
end;
constructor TPointOfIncidence.Create;
begin
FLines := TStringList.Create;
FHorizontalMirrorCandidates := specialize TList<Integer>.Create;
FVerticalMirrorCandidates := specialize TList<Integer>.Create;
end;
destructor TPointOfIncidence.Destroy;
begin
FLines.Free;
FHorizontalMirrorCandidates.Free;
FVerticalMirrorCandidates.Free;
inherited Destroy;
end;
procedure TPointOfIncidence.ProcessDataLine(const ALine: string);
begin
if ALine <> '' then
ProcessPatternLine(ALine)
else
FinishPattern;
end;
procedure TPointOfIncidence.Finish;
begin
FinishPattern;
end;
function TPointOfIncidence.GetDataFileName: string;
begin
Result := 'point_of_incidence.txt';
end;
function TPointOfIncidence.GetPuzzleName: string;
begin
Result := 'Day 13: Point of Incidence';
end;
end.

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@ -92,6 +92,10 @@
<Filename Value="UHotSpringsTestCases.pas"/>
<IsPartOfProject Value="True"/>
</Unit>
<Unit>
<Filename Value="UPointOfIncidenceTestCases.pas"/>
<IsPartOfProject Value="True"/>
</Unit>
</Units>
</ProjectOptions>
<CompilerOptions>

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@ -6,7 +6,7 @@ uses
Interfaces, Forms, GuiTestRunner, USolver, UBaseTestCases, UTrebuchetTestCases, UCubeConundrumTestCases,
UGearRatiosTestCases, UScratchcardsTestCases, UGiveSeedFertilizerTestCases, UWaitForItTestCases, UCamelCardsTestCases,
UHauntedWastelandTestCases, UMirageMaintenanceTestCases, UPipeMazeTestCases, UCosmicExpansionTestCases,
UHotSpringsTestCases;
UHotSpringsTestCases, UPointOfIncidenceTestCases;
{$R *.res}

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@ -0,0 +1,78 @@
{
Solutions to the Advent Of Code.
Copyright (C) 2023 Stefan Müller
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
}
unit UPointOfIncidenceTestCases;
{$mode ObjFPC}{$H+}
interface
uses
Classes, SysUtils, fpcunit, testregistry, USolver, UBaseTestCases, UPointOfIncidence;
type
{ TPointOfIncidenceFullDataTestCase }
TPointOfIncidenceFullDataTestCase = class(TEngineBaseTest)
protected
function CreateSolver: ISolver; override;
published
procedure TestPart1;
end;
{ TPointOfIncidenceExampleTestCase }
TPointOfIncidenceExampleTestCase = class(TExampleEngineBaseTest)
protected
function CreateSolver: ISolver; override;
published
procedure TestPart1;
end;
implementation
{ TPointOfIncidenceFullDataTestCase }
function TPointOfIncidenceFullDataTestCase.CreateSolver: ISolver;
begin
Result := TPointOfIncidence.Create;
end;
procedure TPointOfIncidenceFullDataTestCase.TestPart1;
begin
AssertEquals(37718, FSolver.GetResultPart1);
end;
{ TPointOfIncidenceExampleTestCase }
function TPointOfIncidenceExampleTestCase.CreateSolver: ISolver;
begin
Result := TPointOfIncidence.Create;
end;
procedure TPointOfIncidenceExampleTestCase.TestPart1;
begin
AssertEquals(405, FSolver.GetResultPart1);
end;
initialization
RegisterTest(TPointOfIncidenceFullDataTestCase);
RegisterTest(TPointOfIncidenceExampleTestCase);
end.