Added Graphs

Graphs/Graphs.sln

@@ -0,0 +1,31 @@
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+Microsoft Visual Studio Solution File, Format Version 12.00
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+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
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+		{A6417E74-AE0F-4E3E-9472-AB7A9423BF90}.Release|x86.Build.0 = Release|Win32
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+	EndGlobalSection
+EndGlobal

Graphs/Graphs/Graph.cpp

@@ -0,0 +1,175 @@
+#include "Graph.h"
+#include "GraphAlgo.h"
+
+
+void GraphNode::add_neigbor(GraphNode* neighboor)
+{
+	neighbors.insert(neighboor);
+}
+
+void GraphNode::remove_neighbor(GraphNode* neighboor)
+{
+	neighbors.erase(neighboor);
+}
+
+GraphNode::GraphNode()
+{
+}
+
+GraphNode::GraphNode(const string& aname)
+{
+	name = aname;
+}
+
+const string GraphNode::get_name() const
+{
+	return name;
+}
+
+const bool& GraphNode::operator==(const GraphNode& r)
+{
+	return name == r.name;
+}
+
+void Graph::add_node(GraphNode* GraphNode)
+{
+	if (taken_names[GraphNode->name]) {
+		throw Graph_exception();
+	}
+	else {
+		taken_names[GraphNode->name] = true;
+		nodes.insert(GraphNode);
+	}
+}
+
+void Graph::remove_node(GraphNode* GraphNode)
+{
+	nodes.erase(GraphNode);
+	for (auto it = nodes.begin(); it != nodes.end(); it++) {
+		(*it)->remove_neighbor(GraphNode);
+	}
+
+}
+
+void Graph::add_edge(GraphNode* begin, GraphNode* end)
+{
+	if (nodes.find(begin) == nodes.end())
+		return;
+	if (nodes.find(end) == nodes.end())
+		return;
+	begin->add_neigbor(end);
+	end->add_neigbor(begin);
+}
+
+void Graph::remove_edge(GraphNode* begin, GraphNode* end)
+{
+	if (nodes.find(begin) == nodes.end())
+		return;
+	if (nodes.find(end) == nodes.end())
+		return;
+	begin->remove_neighbor(end);
+	end->remove_neighbor(begin);
+}
+
+
+
+Graph Graph::read_file(const string &file_name)
+{
+	Graph graph = Graph();
+	ifstream input;
+	input.open(file_name);
+	if (input.is_open()) {
+		string line;
+		getline(input, line);
+
+		while (getline(input, line)) {
+			string fir = "", sec = "";
+			int splitter = 0;
+			while (line[splitter] != '\t')
+			{
+				fir += line[splitter];
+				splitter++;
+			}
+			splitter++;
+			while (line[splitter])
+			{
+				sec += line[splitter];
+				splitter++;
+			}
+
+			graph.saved[fir] = graph.taken_names[fir] ? graph.saved[fir] : GraphNode(fir);
+			graph.saved[sec] = graph.taken_names[sec] ? graph.saved[sec] : GraphNode(sec);
+
+			try {
+				graph.add_node(&graph.saved[fir]);
+			}
+			catch (Graph_exception ex) {}
+			try {
+				graph.add_node(&graph.saved[sec]);
+			}
+			catch (Graph_exception ex) {}
+
+			graph.add_edge(&graph.saved[fir], &graph.saved[sec]);
+		}
+	}
+	input.close();
+
+	return graph;
+}
+
+void Graph::write_graph(vector<vector<node_iterator>> ind)
+{
+	int size = ind.size();
+	for (int i = 0; i < size; i++) {
+
+		string c_name = "graph";
+		c_name += (i + 49);
+		c_name += ".txt";
+
+		ofstream out(c_name);
+		for (int j = 0; j < ind[i].size(); j++) {
+			auto& cur = *ind[i][j];
+			auto it = cur->neighbors.begin();
+			while (it != cur->neighbors.end()) {
+				auto neighb = *it;
+				out << cur->name << '\t' << neighb->name << '\n';
+				it++;
+			}
+		}
+		out.close();
+	}
+}
+
+void Graph::find_independent_graphs()
+{
+	int size = nodes.size();
+	vector <vector <node_iterator> > independent;
+	set<GraphNode*> working_nodes = nodes;
+
+
+	for (int i = 0; i < size; i++) {
+
+		set<GraphNode*>::iterator it = working_nodes.begin(), compared = working_nodes.begin();
+		vector<node_iterator> tmp_nodes;
+		tmp_nodes.push_back(nodes.find(*it));
+
+		BFS fs(this);
+		compared++;
+		while (compared != working_nodes.end()) {
+
+			if (fs.connected(*it, *compared))
+				tmp_nodes.push_back(nodes.find(*compared));
+			compared++;
+
+		}
+
+		independent.push_back(tmp_nodes);
+
+		for (int i = 0; i < tmp_nodes.size(); i++) {
+			working_nodes.erase(working_nodes.find(*tmp_nodes[i]));
+			size--;
+		}
+	}
+
+	write_graph(independent);
+}

Graphs/Graphs/Graph.h

@@ -0,0 +1,68 @@
+#pragma once 
+#include <string>
+#include <map>
+#include <set>
+#include <fstream>
+#include <vector>
+#include <iostream>
+
+using namespace std;
+
+
+class Graph_exception {};
+
+class GraphNode {
+	typedef set<GraphNode*>::const_iterator node_iterator;
+
+private:
+	string name;
+	set <GraphNode*> neighbors;
+	void add_neigbor(GraphNode* neighboor);
+	void remove_neighbor(GraphNode* neighboor);
+
+public:
+	GraphNode();
+	GraphNode(const string& aname);
+	const string get_name() const;
+
+
+	node_iterator nb_begin() const {
+		return neighbors.begin();
+	};
+	node_iterator nb_end() const {
+		return neighbors.end();
+	};
+
+	const bool& operator == (const GraphNode& r);
+
+
+	friend class Graph;
+};
+
+class Graph
+{
+	typedef set<GraphNode*>::const_iterator node_iterator;
+private:
+	map <string, bool> taken_names;
+	map <string, GraphNode> saved;
+	set<GraphNode*> nodes;
+	void write_graph(vector <vector <node_iterator> > ind);
+public:
+	Graph() {};
+	void add_node(GraphNode* node);
+	void remove_node(GraphNode* node);
+	void add_edge(GraphNode* begin, GraphNode* end);
+	void remove_edge(GraphNode* begin, GraphNode* end);
+	static Graph read_file(const string& file_name);
+	void find_independent_graphs();
+
+
+	node_iterator begin() {
+		return nodes.begin();
+	};
+
+	node_iterator end() {
+		return nodes.end();
+	};
+	friend class Node;
+};

Graphs/Graphs/GraphAlgo.cpp

@@ -0,0 +1,37 @@
+#include "GraphAlgo.h"
+#include <queue>
+
+using namespace std;
+
+bool DFS::connected(GraphNode* begin, GraphNode* end) {
+	visited.clear(); return connected(begin, end, 0);
+}
+bool DFS::connected(GraphNode* begin, GraphNode* end, int depth) {
+	if (begin == end) return true;
+	visited.insert(begin);
+	for (node_iterator it = begin->nb_begin();
+		it != begin->nb_end(); it++) {
+		if (visited.find(*it) == visited.end()) {
+			if (connected(*it, end, depth + 1)) return true;
+		}
+	}
+	return false;
+}
+
+
+bool BFS::connected(GraphNode* begin, GraphNode* end) {
+	deque <GraphNode*> nodes;
+	nodes.push_back(begin);
+	set<GraphNode*> visited;
+	while (!nodes.empty()) {
+		GraphNode* next = nodes.front(); nodes.pop_front();
+		if (end == next) return true;
+		visited.insert(next);
+		for (node_iterator it = next->nb_begin();
+			it != next->nb_end(); it++)
+			if (visited.find(*it) == visited.end())
+				nodes.push_back(*it);
+	}
+	return false;
+}
+

Graphs/Graphs/GraphAlgo.h

@@ -0,0 +1,28 @@
+#pragma once
+#include "Graph.h"
+
+class BFS
+{
+    typedef set<GraphNode*>::const_iterator node_iterator;
+    const Graph* graph;
+public:
+    BFS(const Graph* agraph) : graph(agraph) {}
+    bool connected(GraphNode* begin, GraphNode* end);
+    friend Graph;
+    friend GraphNode;
+};
+
+
+class DFS {
+    typedef set<GraphNode*>::const_iterator node_iterator;
+private:
+    const Graph* graph;
+    set<GraphNode*> visited;
+    bool connected(GraphNode* begin, GraphNode* end, int depth);
+public:
+
+    DFS(const Graph* agraph) : graph(agraph) {}
+    bool connected(GraphNode* begin, GraphNode* end);
+    friend Graph;
+    friend GraphNode;
+};

Graphs/Graphs/Graphs.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+#include "Graph.h"
+#include "GraphAlgo.h"
+
+using namespace std;
+
+
+int main()
+{
+	string filename;
+	cout << "Введите название файла с графом: ";
+	cin >> filename;
+	Graph gr = Graph::read_file(filename);
+	gr.find_independent_graphs();
+	cout << "fin." << endl;
+}

Graphs/Graphs/Graphs.vcxproj

@@ -0,0 +1,141 @@
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Graphs/Graphs/Graphs.vcxproj.filters

@@ -0,0 +1,36 @@
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Graphs/Graphs/graph.txt

@@ -0,0 +1,62 @@
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Graphs/Graphs/graph1.txt

@@ -0,0 +1,120 @@
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Graphs/Graphs/graph2.txt

@@ -0,0 +1,2 @@
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