Merge branch 'cmake'

include/aoc/CeresSearch.h

@@ -0,0 +1,33 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <vector>
+
+#include "LinesSolver.h"
+
+class CeresSearch :
+    public LinesSolver
+{
+public:
+    std::string getPuzzleName() const override;
+    std::string getInputFileName() const override;
+    void finish() override;
+private:
+    char xmas[4] = { 'X', 'M', 'A', 'S' };
+    void computeXmasCount(const Point2& start);
+    void computeX_MasCount(const Point2& start);
+};

include/aoc/GuardGallivant.h

@@ -0,0 +1,35 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include "LinesSolver.h"
+
+class GuardGallivant :
+    public LinesSolver
+{
+public:
+    Point2 start_{};
+    std::string getPuzzleName() const override;
+    std::string getInputFileName() const override;
+    void processDataLine(const std::string& line) override;
+    void finish() override;
+    void visitPosition(const Point2& current);
+    size_t turnDirection(const size_t current) const;
+    size_t getStartDirectionIndex() const;
+    char getStartChar() const;
+    char getVisitedChar() const;
+    char getObstructionChar() const;
+};

include/aoc/HistorianHysteria.h

@@ -0,0 +1,33 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <set>
+
+#include <aoc/Solver.h>
+
+class HistorianHysteria
+    : public Solver
+{
+public:
+    virtual std::string getPuzzleName() const override;
+    virtual std::string getInputFileName() const override;
+    virtual void processDataLine(const std::string& line) override;
+    virtual void finish() override;
+private:
+    std::multiset<int> left;
+    std::multiset<int> right;
+};

include/aoc/LinesSolver.h

@@ -0,0 +1,33 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <vector>
+
+#include "Solver.h"
+#include "Point2.h"
+
+class LinesSolver :
+    public Solver
+{
+public:
+    void processDataLine(const std::string& line) override;
+protected:
+    std::vector<std::string> lines{};
+    bool isInBounds(const Point2& point) const;
+    char getPosition(const Point2& point) const;
+    void setPosition(const Point2& point, const char value);
+};

include/aoc/MullCharState.h

@@ -0,0 +1,33 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/StringState.h>
+
+class MullCharState
+    : public StringState
+{
+public:
+    MullCharState(const char expected);
+    void enter(StringStateMachine* stateMachine) override {};
+    void next(StringStateMachine* stateMachine) override;
+    void exit(StringStateMachine* stateMachine) override {};
+    void setTransitions(StringState& successState, StringState& failState);
+private:
+    char expected_;
+    StringState* successState_;
+    StringState* failState_;
+};

include/aoc/MullData.h

@@ -0,0 +1,35 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+class MullData
+{
+public:
+    MullData();
+    bool getIsEnabled();
+    void setIsEnabled(const bool value);
+    int getFactor(const int index);
+    void setFactor(const int index, const int value);
+    void updateResult();
+    long long int getResultPart1();
+    long long int getResultPart2();
+private:
+    bool isEnabled_;
+    int factor1_;
+    int factor2_;
+    long long int part1_;
+    long long int part2_;
+};

include/aoc/MullDataState.h

@@ -0,0 +1,28 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/MullData.h>
+#include <aoc/StringState.h>
+
+class MullDataState
+    : public StringState
+{
+public:
+    void setData(MullData& data);
+protected:
+    MullData* data_{ nullptr };
+};

include/aoc/MullDoOpenState.h

@@ -0,0 +1,32 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/MullDataState.h>
+
+class MullDoOpenState
+    : public MullDataState
+{
+public:
+    void enter(StringStateMachine* stateMachine) override {};
+    void next(StringStateMachine* stateMachine) override;
+    void exit(StringStateMachine* stateMachine) override {};
+    void setTransitions(StringState& doState, StringState& dontState, StringState& failState);
+private:
+    StringState* doState_;
+    StringState* dontState_;
+    StringState* failState_;
+};

include/aoc/MullEntryState.h

@@ -0,0 +1,31 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/StringState.h>
+
+class MullEntryState
+    : public StringState
+{
+public:
+    void enter(StringStateMachine* stateMachine) override;
+    void next(StringStateMachine* stateMachine) override;
+    void exit(StringStateMachine* stateMachine) override {};
+    void setTransitions(StringState& mulState, StringState& doState);
+private:
+    StringState* mulState_;
+    StringState* doState_;
+};

include/aoc/MullFactorState.h

@@ -0,0 +1,34 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/MullDataState.h>
+
+class MullFactorState
+    : public MullDataState
+{
+public:
+    MullFactorState(const char expected, const int index);
+    void enter(StringStateMachine* stateMachine) override;
+    void next(StringStateMachine* stateMachine) override;
+    void exit(StringStateMachine* stateMachine) override {};
+    void setTransitions(StringState& successState, StringState& failState);
+private:
+    char expected_;
+    int index_;
+    StringState* successState_;
+    StringState* failState_;
+};

include/aoc/MullItOver.h

@@ -0,0 +1,34 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/MullData.h>
+#include <aoc/MullStates.h>
+#include <aoc/Solver.h>
+
+class MullItOver
+    : public Solver
+{
+public:
+    MullItOver();
+    std::string getPuzzleName() const override;
+    std::string getInputFileName() const override;
+    void processDataLine(const std::string& line) override;
+    void finish() override;
+private:
+    MullData data_;
+    MullStates states_;
+};

include/aoc/MullStates.h

@@ -0,0 +1,41 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/MullCharState.h>
+#include <aoc/MullDoOpenState.h>
+#include <aoc/MullEntryState.h>
+#include <aoc/MullFactorState.h>
+#include <aoc/MullToggleCloseState.h>
+
+class MullStates
+{
+public:
+    MullStates(MullData& data);
+    MullEntryState entryState;
+    MullCharState uState{ 'u' };
+    MullCharState lState{ 'l' };
+    MullCharState mulOpenState{ '(' };
+    MullFactorState factor1State{ ',', 1 };
+    MullFactorState factor2State{ ')', 2 };
+    MullCharState oState{ 'o' };
+    MullDoOpenState doOpenState;
+    MullToggleCloseState doCloseState{ true };
+    MullCharState apostropheState{ '\'' };
+    MullCharState tState{ 't' };
+    MullCharState dontOpenState{ '(' };
+    MullToggleCloseState dontCloseState{ false };
+};

include/aoc/MullToggleCloseState.h

@@ -0,0 +1,32 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/MullDataState.h>
+
+class MullToggleCloseState
+    : public MullDataState
+{
+public:
+    MullToggleCloseState(const bool isEnabler);
+    void enter(StringStateMachine* stateMachine) override {};
+    void next(StringStateMachine* stateMachine) override;
+    void exit(StringStateMachine* stateMachine) override {};
+    void setTransitions(StringState& successState);
+private:
+    bool isEnabler_;
+    StringState* successState_;
+};

include/aoc/Point2.h

@@ -0,0 +1,44 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+class Point2
+{
+public:
+    static const Point2 left, right, up, down;
+    static const Point2 upLeft, upRight, downLeft, downRight;
+    /// <summary>
+    /// The eight cardinal and diagonal directions starting down, rotating in
+    /// positive direction.
+    /// </summary>
+    static const Point2 directions[8];
+    /// <summary>
+    /// The four cardinal directions starting down, rotating in positive direction.
+    /// </summary>
+    static const Point2 cardinalDirections[4];
+    int x, y;
+    Point2();
+    Point2(const int x, const int y);
+    bool operator==(const Point2& rhs) const;
+    bool operator!=(const Point2& rhs) const;
+    Point2 operator+(const Point2& rhs) const;
+    Point2 operator-(const Point2& rhs) const;
+    Point2 operator*(const int rhs) const;
+    Point2 operator-() const;
+    Point2& operator+=(const Point2& rhs);
+    Point2& operator-=(const Point2& rhs);
+    Point2& operator*=(const int rhs);
+};

include/aoc/PrintQueue.h

@@ -0,0 +1,39 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include "Solver.h"
+
+class PrintQueue :
+    public Solver
+{
+public:
+    PrintQueue();
+    std::string getPuzzleName() const override;
+    std::string getInputFileName() const override;
+    void processDataLine(const std::string& line) override;
+    void finish() override;
+private:
+    static const int nPages_{ 49 };
+    static const int maxPageNo_{ 99 };
+    bool isProcessingOrderingRules_;
+    int pageNoMapIndex_;
+    int pageNoMap_[maxPageNo_ + 1];
+    bool orderingRules_[nPages_][nPages_];
+    size_t getMapped(const int pageNo);
+    void processOrderingRule(const std::string& line);
+    void processUpdatePages(const std::string& line);
+};

include/aoc/Program.h

@@ -0,0 +1,28 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+class Program
+{
+public:
+    void run();
+private:
+    void runSolvers();
+    std::vector<std::string> getInputPaths() const;
+};

include/aoc/RedNosedReportData.h

@@ -0,0 +1,32 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include<vector>
+
+#include <aoc/Slope.h>
+
+class RedNosedReportData
+{
+public:
+    bool isSafe{ true };
+    bool canUseDampener{ true };
+    bool mustSkipPrevious{ false };
+    bool mustCheckSlopeReversal{ false };
+    bool mustAwaitFourLevels{ false };
+    Slope slope{ Slope::Unknown };
+    std::vector<int> levels{};
+};

include/aoc/RedNosedReports.h

@@ -0,0 +1,33 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <aoc/Slope.h>
+#include <aoc/Solver.h>
+#include <aoc/RedNosedReportData.h>
+
+class RedNosedReports
+    : public Solver
+{
+public:
+    std::string getPuzzleName() const override;
+    std::string getInputFileName() const override;
+    void processDataLine(const std::string& line) override;
+    void finish() override;
+private:
+    void checkLastLevel(const Slope sameSlope, const Slope otherSlope,
+        const int delta, const int sign, RedNosedReportData& data);
+};

include/aoc/Slope.h

@@ -0,0 +1,18 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+enum class Slope { Unknown, Increasing, Decreasing };

include/aoc/Solver.h

@@ -0,0 +1,34 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <string>
+
+class Solver
+{
+public:
+    Solver();
+    virtual ~Solver(){};
+    virtual std::string getPuzzleName() const = 0;
+    virtual std::string getInputFileName() const = 0;
+    virtual void processDataLine(const std::string &line) = 0;
+    virtual void finish() = 0;
+    long long int getResultPart1() const;
+    long long int getResultPart2() const;
+protected:
+    long long int part1;
+    long long int part2;
+};

include/aoc/SolverEngine.h

@@ -0,0 +1,34 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <filesystem>
+#include <string>
+#include <memory>
+#include <vector>
+
+#include <aoc/Solver.h>
+
+class SolverEngine
+{
+public:
+    SolverEngine(const std::vector<std::string>& inputPaths);
+    void run(Solver& solver);
+
+private:
+    std::vector<std::string> inputPaths_;
+    std::filesystem::path tryGetValidFullInputFilePath(const std::string& inputFileName);
+};

include/aoc/StringState.h

@@ -0,0 +1,31 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <vector>
+
+#include <aoc/StringStateMachine.h>
+
+class StringStateMachine;
+
+class StringState
+{
+public:
+    virtual void enter(StringStateMachine* stateMachine) = 0;
+    virtual void next(StringStateMachine* stateMachine) = 0;
+    virtual void exit(StringStateMachine* stateMachine) = 0;
+    virtual ~StringState() {};
+};

include/aoc/StringStateMachine.h

@@ -0,0 +1,36 @@
+// Solutions to the Advent Of Code 2024.
+// Copyright (C) 2024  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/>.
+
+#pragma once
+
+#include <string>
+
+#include <aoc/StringState.h>
+
+class StringState;
+
+class StringStateMachine
+{
+public:
+    StringStateMachine(const std::string& line, StringState& entryState);
+    void run();
+    char getCurrent() const;
+    void setState(StringState& state);
+private:
+    std::string line_;
+    StringState* entryState_;
+    StringState* currentState_;
+    char current_;
+};