diff --git a/sem1/test3/test3.3/file.txt b/sem1/test3/test3.3/file.txt
new file mode 100644
index 0000000..3c74f58
--- /dev/null
+++ b/sem1/test3/test3.3/file.txt
@@ -0,0 +1,7 @@
+7 6
+1 -1 0 0 0 0 0
+0 1 -1 0 0 0 0
+-1 0 1 1 0 0 0
+0 0 0 -1 -1 -1 1
+0 0 0 0 1 0 0
+0 0 0 0 0 1 -1
\ No newline at end of file
diff --git a/sem1/test3/test3.3/graph.cpp b/sem1/test3/test3.3/graph.cpp
new file mode 100644
index 0000000..d65bf59
--- /dev/null
+++ b/sem1/test3/test3.3/graph.cpp
@@ -0,0 +1,161 @@
+#include <iostream>
+#include <fstream>
+#include "graph.h"
+using namespace std;
+
+struct Graph
+{
+    int ways;
+    int vertexes;
+    bool *select;
+    int **graph;
+};
+
+int readNumber(ifstream &file, char &symbol)
+{
+    int result = 0;
+    int sign = 1;
+    if (symbol == '-')
+    {
+        sign = -sign;
+        file.get(symbol);
+    }
+    while (symbol != ' ' && symbol != '\n' && !file.eof())
+    {
+        result = result * 10 + (symbol - '0');
+        file.get(symbol);
+    }
+    file.get(symbol);
+    return result * sign;
+}
+
+Graph *createGraph(const char *nameOfFile)
+{
+    Graph *graph = new Graph {};
+    ifstream file(nameOfFile);
+    char symbol = '\0';
+    file.get(symbol);
+    graph->ways = readNumber(file, symbol);
+    graph->vertexes = readNumber(file, symbol);
+    graph->select = new bool[graph->vertexes] {};
+    graph->graph = new int *[graph->ways] {};
+    for (int i = 0; i < graph->ways; i++)
+    {
+        graph->graph[i] = new int[graph->vertexes] {};
+    }
+    file.close();
+    return graph;
+}
+
+void fillGraph(Graph *graph, const char *nameOfFile)
+{
+    ifstream file(nameOfFile);
+    char symbol = '\0';
+    file.get(symbol);
+    while (symbol != '\n')
+    {
+        file.get(symbol);
+    }
+    file.get(symbol);
+    for (int i = 0; i < graph->vertexes; i++)
+    {
+        for (int j = 0; j < graph->ways; j++)
+        {
+            graph->graph[j][i] = readNumber(file, symbol);
+        }
+    }
+    file.close();
+}
+
+void findVertex(Graph *graph, int indexOfVertex, bool *visited)
+{
+    visited[indexOfVertex] = true;
+    for (int i = 0; i < graph->ways; i++)
+    {
+        if (graph->graph[i][indexOfVertex] == -1)
+        {
+            for (int j = 0; j < graph->vertexes; j++)
+            {
+                if (graph->graph[i][j] == 1 && !visited[j])
+                {
+                    findVertex(graph, j, visited);
+                }
+            }
+        }
+    }
+}
+
+void nullVisited(bool *visited, int length)
+{
+    for (int i = 0; i < length; i++)
+    {
+        visited[i] = false;
+    }
+}
+
+bool allVisited(bool *visited, int length)
+{
+    for (int i = 0; i < length; i++)
+    {
+        if (!visited[i])
+        {
+            return false;
+        }
+    }
+    return true;
+}
+
+void findVertexes(Graph *graph)
+{
+    bool *visited = new bool[graph->vertexes] {};
+    for (int i = 0; i < graph->vertexes; i++)
+    {
+        nullVisited(visited, graph->vertexes);
+        findVertex(graph, i, visited);
+        if (allVisited(visited, graph->vertexes))
+        {
+            graph->select[i] = true;
+        }
+    }
+    delete[] visited;
+}
+
+void displayVertexes(Graph *graph)
+{
+    bool exists = false;
+    for (int i = 0; i < graph->vertexes; i++)
+    {
+        if (graph->select[i])
+        {
+            exists = true;
+            cout << i << endl;
+        }
+    }
+    if (!exists)
+    {
+        cout << "Not found";
+    }
+}
+
+void deleteGraph(Graph *graph)
+{
+    for (int i = 0; i < graph->ways; i++)
+    {
+        delete[] graph->graph[i];
+    }
+    delete[] graph->graph;
+    delete[] graph->select;
+    delete graph;
+}
+
+void displayGraph(Graph *graph)
+{
+    for (int i = 0; i < graph->vertexes; i++)
+    {
+        for (int j = 0; j < graph->ways; j++)
+        {
+            cout << graph->graph[j][i] << " ";
+        }
+        cout << endl;
+    }
+}
diff --git a/sem1/test3/test3.3/graph.h b/sem1/test3/test3.3/graph.h
new file mode 100644
index 0000000..341b777
--- /dev/null
+++ b/sem1/test3/test3.3/graph.h
@@ -0,0 +1,12 @@
+#pragma once
+
+struct Graph;
+
+Graph *createGraph(const char *nameOfFile);
+void deleteGraph(Graph *graph);
+
+void fillGraph(Graph *graph, const char *nameOfFile);
+void findVertexes(Graph *graph);
+void displayVertexes(Graph *graph);
+
+void displayGraph(Graph *graph);
diff --git a/sem1/test3/test3.3/main.cpp b/sem1/test3/test3.3/main.cpp
new file mode 100644
index 0000000..006d30b
--- /dev/null
+++ b/sem1/test3/test3.3/main.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include "graph.h"
+using namespace std;
+
+int main()
+{
+    const char *nameOfFile = "file.txt";
+    Graph *graph = createGraph(nameOfFile);
+    fillGraph(graph, nameOfFile);
+    findVertexes(graph);
+    cout << "Result:" << endl;
+    displayVertexes(graph);
+    deleteGraph(graph);
+}