commit 1c8c1b92a70f64f81c4199d7d62c013ae51e50ff
Author: Rendo <Rendo>
Date:   Sun Jun 21 23:12:29 2026 +0500

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ba2906d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+main
diff --git a/input.txt b/input.txt
new file mode 100644
index 0000000..2503c88
--- /dev/null
+++ b/input.txt
@@ -0,0 +1,6 @@
+C 4
+0 0
+0 1 1 1
+1 0 1 1
+1 1 0 0
+1 1 0 1
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..bdbdb9e
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,446 @@
+#include <algorithm>
+#include <climits>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <tuple>
+#include <set>
+#include <vector>
+
+using namespace std;
+
+// Базовый класс представления
+class IGRepr {
+public:
+	virtual void from_file(string filepath) = 0;
+	virtual void to_file(string filepath,bool is_oriented, bool is_weighted) = 0;
+	virtual void add_edge(int vertex_a, int vertex_b, int weight) = 0;
+	virtual void remove_edge(int vertex_a, int vertex_b) = 0;
+	virtual int change_weight(int vertex_a, int vertex_b, int new_weight) = 0;
+	virtual vector<tuple<int,int,int>> get_edges() = 0;
+	virtual ~IGRepr() {};
+	virtual int count_vertices() = 0;
+};
+
+// Представление в виде матрицы смежности
+class AdjMatrix: public IGRepr {
+private:
+	vector<vector<int>> matrix;
+public:
+	AdjMatrix(int n = 0);
+	virtual void from_file(string filepath) override;
+	virtual void to_file(string filepath,bool is_oriented, bool is_weighted) override;
+	virtual void add_edge(int vertex_a, int vertex_b, int weight) override;
+	virtual void remove_edge(int vertex_a, int vertex_b) override;
+	virtual int change_weight(int vertex_a, int vertex_b, int new_weight) override;
+	virtual vector<tuple<int,int,int>> get_edges() override;
+	virtual int count_vertices() override;
+};
+
+AdjMatrix::AdjMatrix(int n) {
+	for (int i = 0; i < n; i++){
+		vector<int> temp;
+		for (int j = 0; j < n; j++)
+			temp.push_back(0);
+		matrix.push_back(temp);
+	}
+}
+
+void AdjMatrix::add_edge(int vertex_a, int vertex_b, int weight){
+	if (matrix[vertex_a][vertex_b] != 0) return;
+	matrix[vertex_a][vertex_b] = weight;
+}
+
+void AdjMatrix::remove_edge(int vertex_a, int vertex_b) {
+	matrix[vertex_a][vertex_b] = 0;
+}
+int AdjMatrix::change_weight(int vertex_a, int vertex_b, int new_weight) {
+	int old_weight = matrix[vertex_a][vertex_b];
+
+	matrix[vertex_a][vertex_b] = new_weight;
+
+	return old_weight;
+}
+void AdjMatrix::from_file(string filepath) {
+	ifstream file{filepath};
+	string buffer;
+
+	// Чтение первых двух строк
+	
+	getline(file,buffer);
+	istringstream initial_iss{buffer};
+	char _type;
+	initial_iss >> _type;
+	int vertices;
+	initial_iss >> vertices;
+	for(int i = 0; i < vertices; i++) {
+		matrix.push_back(vector<int>{});
+		for(int j = 0; j < vertices; j++) {
+			matrix[i].push_back(0);
+		}
+	}
+
+	getline(file,buffer);
+	
+	int from_vertex = 0;
+	// Чтение непосредственно данных
+	while(getline(file,buffer)) {
+		istringstream iss{buffer};
+		int to_vertex = 0;
+		int weight;
+		while (iss >> weight) {
+			matrix[from_vertex][to_vertex] = weight;
+			to_vertex += 1;
+		}
+		from_vertex += 1;
+	}
+
+	file.close();
+}
+void AdjMatrix::to_file(string filepath,bool is_oriented, bool is_weighted) {
+	ofstream file{filepath};
+
+	file << 'C' << matrix.size() << " " << endl;
+	file << (int)is_oriented << " " << (int)is_weighted << endl;
+	for(int i = 0; i < matrix.size(); i++){
+		for(int j = 0; j < matrix[i].size(); j++)
+			file << matrix[i][j] << " ";
+		file << endl;
+	}
+}
+
+vector<tuple<int,int,int>> AdjMatrix::get_edges() {
+	vector<tuple<int,int,int>> result;
+	for(int i = 0; i < matrix.size(); i++)
+		for (int j = 0; j < matrix[i].size(); j++)
+			if (matrix[i][j] != 0)
+				result.push_back({i,j,matrix[i][j]});
+	return result;
+}
+
+int AdjMatrix::count_vertices() {
+	return matrix.size();
+}
+
+// Представление в виде списка смежных вершин
+class AdjList: public IGRepr {
+private:
+	vector<set<pair<int, int>>> list;
+public:
+	AdjList(int n=0);
+	virtual void from_file(string filepath) override;
+	virtual void to_file(string filepath,bool is_oriented, bool is_weighted) override;
+	virtual void add_edge(int vertex_a, int vertex_b, int weight) override;
+	virtual void remove_edge(int vertex_a, int vertex_b) override;
+	virtual int change_weight(int vertex_a, int vertex_b, int new_weight) override;
+	virtual vector<tuple<int,int,int>> get_edges() override;
+	virtual int count_vertices() override;
+};
+
+AdjList::AdjList(int n){
+	for(int i = 0; i < n; i++)
+		list.push_back({});
+}
+
+void AdjList::add_edge(int vertex_a, int vertex_b, int weight){
+	auto found = list[vertex_a].lower_bound({vertex_b,INT_MIN});
+	if (found != list[vertex_a].end() && found->first == vertex_b)
+		return;
+	list[vertex_a].insert({vertex_b,weight});
+}
+
+void AdjList::remove_edge(int vertex_a, int vertex_b) {
+	auto found = list[vertex_a].lower_bound({vertex_b,INT_MIN});
+	if (found == list[vertex_a].end() || found->first != vertex_b)
+		return;
+	list[vertex_a].erase(*found);
+}
+int AdjList::change_weight(int vertex_a, int vertex_b, int new_weight) {
+	auto found = list[vertex_a].lower_bound({vertex_b,INT_MIN});
+	int old_weight = found->second;
+
+	list[vertex_a].erase(found);
+	list[vertex_a].insert({vertex_b,new_weight});
+
+	return old_weight;
+
+}
+void AdjList::from_file(string filepath) {
+	ifstream file{filepath};
+	string buffer;
+
+	// Чтение первых двух строк
+
+	getline(file,buffer);
+	istringstream initial_iss{buffer};
+	char _type;
+	initial_iss >> _type;
+	int vertices;
+	initial_iss >> vertices;
+	for(int i = 0; i < vertices; i++) {
+		list.push_back(set<pair<int,int>>{});
+	}
+
+	getline(file,buffer);
+	istringstream meta_iss{buffer};
+	bool _oriented, weighted;
+	meta_iss >> _oriented >> weighted;
+
+	int from_vertex = 0;
+	// Чтение непосредственно данных
+	if (weighted) {
+		while(getline(file,buffer)) {
+			istringstream iss{buffer};
+			int to_vertex, weight;
+			while (iss >> to_vertex >> weight) {
+				list[from_vertex].insert({to_vertex,weight});
+			}
+			from_vertex += 1;
+		}
+	}
+	else {
+		while(getline(file,buffer)) {
+			istringstream iss{buffer};
+			int to_vertex;
+			while (iss >> to_vertex) {
+				list[from_vertex].insert({to_vertex,1});
+			}
+			from_vertex += 1;
+		}
+	}
+	file.close();
+}
+void AdjList::to_file(string filepath,bool is_oriented, bool is_weighted) {
+	ofstream file{filepath};
+
+	file << 'L' << " " << list.size() << endl;
+	file << (int)is_oriented << " " << (int)is_weighted << endl;
+	if (is_weighted)
+		for(int i = 0; i < list.size(); i++){
+			for(auto j = list[i].begin(); j != list[i].end(); ++j)
+				file << j->first << " " << j-> second << " ";
+			file << endl;
+		}
+	else
+		for(int i = 0; i < list.size(); i++){
+			for(auto j = list[i].begin(); j != list[i].end(); ++j)
+				file << j->first << " ";
+			file << endl;
+		}
+}
+
+vector<tuple<int,int,int>> AdjList::get_edges() {
+	vector<tuple<int,int,int>> result;
+	for(int i = 0; i < list.size(); i++)
+		for (auto j = list[i].begin(); j != list[i].end(); ++j)
+			result.push_back({i,j->first,j->second});
+	return result;
+}
+
+int AdjList::count_vertices() {
+	return list.size();
+}
+
+// Представление в виде списка рёбер
+class EdgeList: public IGRepr {
+public:
+	vector<tuple<int,int,int>> list;
+	virtual void from_file(string filepath) override;
+	virtual void to_file(string filepath,bool is_oriented, bool is_weighted) override;
+	virtual void add_edge(int vertex_a, int vertex_b, int weight) override;
+	virtual void remove_edge(int vertex_a, int vertex_b) override;
+	virtual int change_weight(int vertex_a, int vertex_b, int new_weight) override;
+	virtual vector<tuple<int,int,int>> get_edges() override;
+	virtual int count_vertices() override;
+};
+void EdgeList::add_edge(int vertex_a, int vertex_b, int weight){
+	auto found = find_if(list.begin(),list.end(),
+		[vertex_a,vertex_b](const tuple<int,int,int>& edge) {
+			return get<0>(edge) == vertex_a && get<1>(edge) == vertex_b;
+		}
+	);
+	if (found != list.end())
+		return;
+	list.push_back({vertex_a,vertex_b,weight});
+}
+
+void EdgeList::remove_edge(int vertex_a, int vertex_b) {
+	auto found = find_if(list.begin(),list.end(),
+						 [vertex_a,vertex_b](const tuple<int,int,int>& edge) {
+							 return get<0>(edge) == vertex_a && get<1>(edge) == vertex_b;
+						 }
+	);
+
+	list.erase(found);
+}
+int EdgeList::change_weight(int vertex_a, int vertex_b, int new_weight) {
+	auto found = find_if(list.begin(),list.end(),
+						 [vertex_a,vertex_b](const tuple<int,int,int>& edge) {
+							 return get<0>(edge) == vertex_a && get<1>(edge) == vertex_b;
+						 }
+	);
+	int old_weight = get<2>(*found);
+
+	list.erase(found);
+	list.push_back({vertex_a,vertex_b,new_weight});
+
+	return old_weight;
+
+}
+void EdgeList::from_file(string filepath) {
+	ifstream file{filepath};
+	string buffer;
+
+	// Чтение первых двух строк
+
+	getline(file,buffer);
+	istringstream initial_iss{buffer};
+	char _type;
+	initial_iss >> _type;
+	int _vertices,edges;
+	initial_iss >> _vertices >> edges;
+	getline(file,buffer);
+	istringstream meta_iss{buffer};
+	bool _oriented, weighted;
+	meta_iss >> _oriented >> weighted;
+
+	// Чтение непосредственно данных
+	if (weighted) {
+		while(getline(file,buffer)) {
+			istringstream iss{buffer};
+			int from_vertex, to_vertex, weight;
+			iss >> from_vertex >> to_vertex >> weight;
+			list.push_back({from_vertex,to_vertex,weight});
+		}
+	}
+	else {
+		while(getline(file,buffer)) {
+			istringstream iss{buffer};
+			int from_vertex, to_vertex;
+			iss >> from_vertex >> to_vertex;
+			list.push_back({from_vertex,to_vertex,1});
+		}
+	}
+	file.close();
+}
+void EdgeList::to_file(string filepath,bool is_oriented, bool is_weighted) {
+	ofstream file{filepath};
+
+	file << 'E' << " " << count_vertices() << " " << list.size() << endl;
+	file << (int)is_oriented << " " << (int)is_weighted << endl;
+	if (is_weighted)
+		for(auto i = list.begin(); i < list.end(); ++i){
+			file << get<0>(*i) << " " << get<1>(*i) << " " << get<2>(*i) << endl;
+		}
+	else
+		for(auto i = list.begin(); i < list.end(); ++i){
+			file << get<0>(*i) << " " << get<1>(*i) << endl;
+		}
+}
+vector<tuple<int,int,int>> EdgeList::get_edges() {
+	return list;
+}
+int EdgeList::count_vertices() {
+	int max_vertex = 0;
+	for(int i = 0; i < list.size(); i++)
+		max_vertex = max(max_vertex,max(get<0>(list[i]),get<1>(list[i])));
+	return max_vertex + 1;
+}
+
+// Непосредственно граф
+class Graph {
+private:
+	IGRepr* repr;
+	bool oriented;
+	bool weighted;
+	void transformTo(IGRepr* new_repr);
+public:
+	void readGraph(string fileName);
+	void writeGraph(string fileName);
+	void addEdge(int from, int to, int weight);
+	void removeEdge(int from, int to);
+	int changeEdge(int from, int to, int newWeight);
+	void transformToAdjList();
+	void transformToAdjMatrix();
+	void transformToListOfEdges();
+	~Graph();
+};
+
+void Graph::readGraph(string fileName) {
+	ifstream file{fileName};
+	string buffer;
+	getline(file,buffer);
+	switch (buffer[0]) {
+		case 'C':
+			repr = new AdjMatrix;
+			break;
+		case 'E':
+			repr = new EdgeList;
+			break;
+		case 'L':
+			repr = new AdjList;
+			break;
+	}
+
+	repr->from_file(fileName);
+	getline(file,buffer);
+	istringstream stream {buffer};
+	stream >> oriented >> weighted;
+	file.close();
+}
+
+void Graph::writeGraph(string fileName){
+	repr->to_file(fileName,oriented,weighted);
+}
+
+void Graph::addEdge(int from, int to, int weight) {
+	repr->add_edge(from, to, weight);
+	if (oriented == false)
+		repr->add_edge(to, from, weight);
+}
+
+void Graph::removeEdge(int from, int to) {
+	repr->remove_edge(from, to);
+	if (oriented == false)
+		repr->remove_edge(to, from);
+}
+int Graph::changeEdge(int from, int to, int newWeight){
+	if (weighted && newWeight != 1)
+		weighted = false;
+	return repr->change_weight(from, to, newWeight);
+}
+
+Graph::~Graph() {
+	delete repr;
+}
+
+void Graph::transformTo(IGRepr* new_repr) {
+	auto edges = repr->get_edges();
+	for (int i = 0; i < edges.size(); i++)
+		new_repr->add_edge(get<0>(edges[i]),get<1>(edges[i]) ,get<2>(edges[i]) );
+	delete repr;
+	repr = new_repr;
+}
+void Graph::transformToAdjList() {
+	transformTo(new AdjList(repr->count_vertices()));
+}
+void Graph::transformToAdjMatrix(){
+	transformTo(new AdjMatrix(repr->count_vertices()));
+}
+
+void Graph::transformToListOfEdges() {
+	transformTo(new EdgeList);
+}
+
+int main() {
+	Graph graph;
+	graph.readGraph("input.txt");
+	graph.transformToAdjList();
+	graph.writeGraph("output_adj_list.txt");
+	graph.transformToListOfEdges();
+	graph.writeGraph("output_edge_list.txt");
+	graph.transformToAdjMatrix();
+	graph.writeGraph("output_adj_matrix.txt");
+
+	return 0;
+}
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..9745b22
--- /dev/null
+++ b/makefile
@@ -0,0 +1,2 @@
+main: main.cpp
+	g++ -lstdc++ main.cpp -o main