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Refactor graph classes

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- Extract base graph logic from WeightedEdgeGraph into new Graph class
- Add LabelGraph to replace old Graph class used by LanParty solver
- Rename WeightedEdgeGraph to WeightGraph and change it to use new Graph class
- Update affected solvers to use new graph classes
This commit is contained in:
Stefan Müller
2025-06-13 16:43:41 +02:00
parent f312893ed1
commit 674553d29b
14 changed files with 362 additions and 253 deletions
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95
include/aoc/common/Graph.hpp
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@@ -1,5 +1,5 @@
// Solutions to the Advent Of Code 2024.
// Copyright (C) 2024 Stefan Müller
// Copyright (C) 2025 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
@@ -15,18 +15,95 @@
#pragma once
#include <map>
#include <memory>
#include <iterator>
#include <vector>
#include <aoc/common/Vertex.hpp>
class Graph
{
public:
const std::map<std::string, std::shared_ptr<Vertex>>& getVertices() const;
void addEdge(const std::string& vertexId1, const std::string& vertexId2);
int addVertex();
void addEdge(const int vertex1, const int vertex2);
size_t getNVertices() const;
size_t getNEdges() const;
bool areAdjacent(const int vertex1, const int vertex2) const;
struct Incidence
{
public:
Incidence(const int vertex, const int edge)
: vertex{ vertex }, edge{ edge }
{
}
int vertex;
int edge;
};
struct NeighborIterator
{
public:
// Iterator traits.
using difference_type = std::ptrdiff_t;
using value_type = Incidence;
using pointer = const value_type*;
using reference = const value_type&;
using iterator_category = std::forward_iterator_tag;
NeighborIterator(const Graph& graph, const int vertex)
: graph_{ graph }, incidence_{ -1 }, value_{ -1, -1 }
{
if (vertex >= 0 && vertex < graph_.firstVertexIncidences_.size())
{
setIncidence(graph_.firstVertexIncidences_[vertex]);
}
};
NeighborIterator& operator++()
{
if (incidence_ >= 0)
{
setIncidence(graph_.nextIncidences_[incidence_]);
}
return *this;
}
NeighborIterator operator++(int)
{
NeighborIterator it = *this;
++(*this);
return it;
}
bool operator==(NeighborIterator other) const
{
return incidence_ == other.incidence_;
}
bool operator!=(NeighborIterator other) const
{
return !(*this == other);
}
const reference operator*() const
{
return value_;
}
const pointer operator->() const
{
return &value_;
}
private:
const Graph& graph_;
int incidence_;
value_type value_;
void setIncidence(const int incidence)
{
incidence_ = incidence;
if (incidence_ >= 0)
{
value_ = { graph_.incidenceVertices_[incidence_], incidence_ >> 1 };
}
}
};
NeighborIterator begin(const int vertex) const;
NeighborIterator end() const;
private:
std::map<std::string, std::shared_ptr<Vertex>> vertices_;
std::shared_ptr<Vertex> findOrAddVertex(const std::string& vertexId);
std::vector<int> firstVertexIncidences_{};
std::vector<int> nextIncidences_{};
std::vector<int> incidenceVertices_{};
};

17
include/aoc/common/VertexEdgeIncidence.hpp → include/aoc/common/GraphPathsResult.hpp
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@@ -15,14 +15,19 @@
#pragma once
class VertexEdgeIncidence
#include <vector>
class GraphPathsResult
{
public:
VertexEdgeIncidence(const int vertex, const int next)
GraphPathsResult()
: distances{}, predecessors{}
{
this->vertex = vertex;
this->next = next;
}
int vertex;
int next;
GraphPathsResult(const size_t size, const int initialDistance, const int initialPredecessor)
: distances(size, initialDistance), predecessors(size, initialPredecessor)
{
}
std::vector<int> distances;
std::vector<int> predecessors;
};

38
include/aoc/common/LabelGraph.hpp Normal file
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@@ -0,0 +1,38 @@
// Solutions to the Advent Of Code 2024.
// Copyright (C) 2025 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 <map>
#include <vector>
#include <aoc/common/Graph.hpp>
class LabelGraph
{
public:
int addVertex(const std::string& label);
void addEdge(const int vertex1, const int vertex2);
bool areAdjacent(const int vertex1, const int vertex2) const;
const std::string& getVertexLabel(const int vertex) const;
const std::map<std::string, int>& getLabelVertices() const;
Graph::NeighborIterator begin(const int vertex) const;
Graph::NeighborIterator end() const;
private:
Graph graph_{};
std::vector<std::string> vertexLabels_{};
std::map<std::string, int> labelVertices_{};
};

38
include/aoc/common/WeightGraph.hpp Normal file
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@@ -0,0 +1,38 @@
// Solutions to the Advent Of Code 2024.
// Copyright (C) 2025 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/common/Graph.hpp>
#include <aoc/common/GraphPathsResult.hpp>
class WeightGraph
{
public:
static constexpr int getInfiniteDistance();
int addVertex(const int weight);
void addEdge(const int vertex1, const int vertex2, const int weight);
int getVertexWeight(const int vertex) const;
int getEdgeWeight(const int edge) const;
GraphPathsResult dijkstra(const int source) const;
Graph::NeighborIterator begin(const int vertex) const;
Graph::NeighborIterator end() const;
private:
Graph graph_{};
std::vector<int> edgeWeights_{};
std::vector<int> vertexWeights_{};
};

129
include/aoc/common/WeightedEdgeGraph.hpp
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@@ -1,129 +0,0 @@
// Solutions to the Advent Of Code 2024.
// Copyright (C) 2025 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 <iterator>
#include <vector>
#include <aoc/common/VertexEdgeIncidence.hpp>
class WeightedEdgeGraph
{
public:
WeightedEdgeGraph();
int addVertex(const int weight = 0);
void addEdge(const int vertex1, const int vertex2, const int weight);
int getVertexWeight(const int vertex) const;
int getEdgeWeight(const int edge) const;
struct PathsResult
{
PathsResult()
: distances{}, predecessors{}
{
}
PathsResult(const size_t size, const int initialDistance, const int initialPredecessor)
: distances(size, initialDistance), predecessors(size, initialPredecessor)
{
}
std::vector<int> distances;
std::vector<int> predecessors;
};
PathsResult dijkstra(const int source) const;
static constexpr int getInfiniteDistance();
struct Incidence
{
public:
Incidence(const int vertex, const int edge)
: vertex{ vertex }, edge{ edge }
{
}
int vertex;
int edge;
};
struct NeighborIterator
{
public:
// Iterator traits.
using difference_type = std::ptrdiff_t;
using value_type = Incidence;
using pointer = const value_type*;
using reference = const value_type&;
using iterator_category = std::forward_iterator_tag;
NeighborIterator(const WeightedEdgeGraph& graph, const int vertex)
: graph_{ graph }, incidence_{ -1 }, value_{ -1, -1 }
{
if (vertex >= 0 && vertex < graph_.firstVertexIncidences_.size())
{
setIncidence(graph_.firstVertexIncidences_[vertex]);
}
};
NeighborIterator& operator++()
{
if (incidence_ >= 0)
{
setIncidence(graph_.vertexEdgeIncidences_[incidence_].next);
}
return *this;
}
NeighborIterator operator++(int)
{
NeighborIterator it = *this;
++(*this);
return it;
}
bool operator==(NeighborIterator other) const
{
return incidence_ == other.incidence_;
}
bool operator!=(NeighborIterator other) const
{
return !(*this == other);
}
const reference operator*() const
{
return value_;
}
const pointer operator->() const
{
return &value_;
}
private:
const WeightedEdgeGraph& graph_;
int incidence_;
value_type value_;
void setIncidence(const int incidence)
{
incidence_ = incidence;
if (incidence_ >= 0)
{
value_ = { graph_.vertexEdgeIncidences_[incidence_].vertex, incidence_ >> 1 };
}
}
};
NeighborIterator begin(const int vertex) const;
NeighborIterator end() const;
private:
std::vector<int> firstVertexIncidences_;
std::vector<VertexEdgeIncidence> vertexEdgeIncidences_;
std::vector<int> edgeWeights_;
std::vector<int> vertexWeights_;
};