diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/graphs.ipynb b/graphs.ipynb
index 412e2a9..3beb3ef 100644
--- a/graphs.ipynb
+++ b/graphs.ipynb
@@ -11,6 +11,8 @@
     }
    },
    "source": [
+    "import queue\n",
+    "\n",
     "# -*- coding: utf-8 -*-\n",
     "\"\"\"Graph module.\n",
     "\n",
@@ -380,6 +382,65 @@
    "outputs": [],
    "execution_count": 3
   },
+  {
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2024-12-02T18:44:40.042481Z",
+     "start_time": "2024-12-02T18:44:40.039811Z"
+    }
+   },
+   "cell_type": "code",
+   "source": [
+    "# -*- coding: utf-8 -*-\n",
+    "\"\"\"Queue module.\"\"\"\n",
+    "\n",
+    "from collections import deque\n",
+    "\n",
+    "class Queue:\n",
+    "    \"\"\"Simple class for FIFO (first-in-first-out) container.\"\"\"\n",
+    "\n",
+    "    def __init__(self):\n",
+    "        \"\"\"Init queue.\"\"\"\n",
+    "\n",
+    "        self.elements = deque()\n",
+    "\n",
+    "    def enqueue(self, elt):\n",
+    "        \"\"\"Add an element to the queue.\n",
+    "\n",
+    "        Args:\n",
+    "            elt (Any): Element to enqueue.\n",
+    "\n",
+    "        \"\"\"\n",
+    "\n",
+    "        self.elements.append(elt)\n",
+    "\n",
+    "    def dequeue(self):\n",
+    "        \"\"\"Remove and return next element from the queue.\n",
+    "\n",
+    "        Returns:\n",
+    "            Any: Element from the queue.\n",
+    "\n",
+    "        Raises:\n",
+    "            IndexError: If queue is empty.\n",
+    "\n",
+    "        \"\"\"\n",
+    "\n",
+    "        return self.elements.popleft()\n",
+    "\n",
+    "    def isempty(self):\n",
+    "        \"\"\"Check whether queue is empty.\n",
+    "\n",
+    "        Returns:\n",
+    "            bool: True if queue is empty, False otherwise.\n",
+    "\n",
+    "        \"\"\"\n",
+    "\n",
+    "        return len(self.elements) == 0\n"
+   ],
+   "id": "663b49e4f6763d11",
+   "outputs": [],
+   "execution_count": 37
+  },
   {
    "metadata": {},
    "cell_type": "markdown",
@@ -644,18 +705,118 @@
    "id": "ebfdd54aefc25650"
   },
   {
-   "metadata": {},
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2024-12-02T18:44:59.949967Z",
+     "start_time": "2024-12-02T18:44:59.927772Z"
+    }
+   },
    "cell_type": "code",
-   "outputs": [],
-   "execution_count": null,
-   "source": "",
-   "id": "b8bf6413a1d63515"
+   "source": [
+    "def aux(G, M, src):\n",
+    "    cur = Queue()\n",
+    "    cur.enqueue(src)\n",
+    "    M[src] = True\n",
+    "    while not cur.isempty():\n",
+    "        x = cur.dequeue()\n",
+    "        print(x, end= \"\")\n",
+    "        for adj in range(G.order):\n",
+    "            if G.adjlists[x][adj] and not M[adj]:\n",
+    "                cur.enqueue(adj)\n",
+    "                M[adj] = True\n",
+    "\n",
+    "def bfs(G):\n",
+    "    M = [False] * G.order\n",
+    "    for src in range(G.order):\n",
+    "        if not M[src]:\n",
+    "            aux(G, M, src)\n",
+    "            print()\n",
+    "\n",
+    "bfs(G)"
+   ],
+   "id": "b8bf6413a1d63515",
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0"
+     ]
+    },
+    {
+     "ename": "IndexError",
+     "evalue": "list index out of range",
+     "output_type": "error",
+     "traceback": [
+      "\u001B[0;31m---------------------------------------------------------------------------\u001B[0m",
+      "\u001B[0;31mIndexError\u001B[0m                                Traceback (most recent call last)",
+      "Cell \u001B[0;32mIn[40], line 20\u001B[0m\n\u001B[1;32m     17\u001B[0m             aux(G, M, src)\n\u001B[1;32m     18\u001B[0m             \u001B[38;5;28mprint\u001B[39m()\n\u001B[0;32m---> 20\u001B[0m \u001B[43mbfs\u001B[49m\u001B[43m(\u001B[49m\u001B[43mG\u001B[49m\u001B[43m)\u001B[49m\n",
+      "Cell \u001B[0;32mIn[40], line 17\u001B[0m, in \u001B[0;36mbfs\u001B[0;34m(G)\u001B[0m\n\u001B[1;32m     15\u001B[0m \u001B[38;5;28;01mfor\u001B[39;00m src \u001B[38;5;129;01min\u001B[39;00m \u001B[38;5;28mrange\u001B[39m(G\u001B[38;5;241m.\u001B[39morder):\n\u001B[1;32m     16\u001B[0m     \u001B[38;5;28;01mif\u001B[39;00m \u001B[38;5;129;01mnot\u001B[39;00m M[src]:\n\u001B[0;32m---> 17\u001B[0m         \u001B[43maux\u001B[49m\u001B[43m(\u001B[49m\u001B[43mG\u001B[49m\u001B[43m,\u001B[49m\u001B[43m \u001B[49m\u001B[43mM\u001B[49m\u001B[43m,\u001B[49m\u001B[43m \u001B[49m\u001B[43msrc\u001B[49m\u001B[43m)\u001B[49m\n\u001B[1;32m     18\u001B[0m         \u001B[38;5;28mprint\u001B[39m()\n",
+      "Cell \u001B[0;32mIn[40], line 9\u001B[0m, in \u001B[0;36maux\u001B[0;34m(G, M, src)\u001B[0m\n\u001B[1;32m      7\u001B[0m \u001B[38;5;28mprint\u001B[39m(x, end\u001B[38;5;241m=\u001B[39m \u001B[38;5;124m\"\u001B[39m\u001B[38;5;124m\"\u001B[39m)\n\u001B[1;32m      8\u001B[0m \u001B[38;5;28;01mfor\u001B[39;00m adj \u001B[38;5;129;01min\u001B[39;00m \u001B[38;5;28mrange\u001B[39m(G\u001B[38;5;241m.\u001B[39morder):\n\u001B[0;32m----> 9\u001B[0m     \u001B[38;5;28;01mif\u001B[39;00m \u001B[43mG\u001B[49m\u001B[38;5;241;43m.\u001B[39;49m\u001B[43madjlists\u001B[49m\u001B[43m[\u001B[49m\u001B[43mx\u001B[49m\u001B[43m]\u001B[49m\u001B[43m[\u001B[49m\u001B[43madj\u001B[49m\u001B[43m]\u001B[49m \u001B[38;5;129;01mand\u001B[39;00m \u001B[38;5;129;01mnot\u001B[39;00m M[adj]:\n\u001B[1;32m     10\u001B[0m         cur\u001B[38;5;241m.\u001B[39menqueue(adj)\n\u001B[1;32m     11\u001B[0m         M[adj] \u001B[38;5;241m=\u001B[39m \u001B[38;5;28;01mTrue\u001B[39;00m\n",
+      "\u001B[0;31mIndexError\u001B[0m: list index out of range"
+     ]
+    }
+   ],
+   "execution_count": 40
   },
   {
    "metadata": {},
    "cell_type": "markdown",
    "source": "# Exercise 2.2 (DFS)",
    "id": "55b1247fe428aa0d"
+  },
+  {
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2024-12-02T18:41:49.173387Z",
+     "start_time": "2024-12-02T18:41:49.149806Z"
+    }
+   },
+   "cell_type": "code",
+   "source": [
+    "def aux(G, M, src):\n",
+    "    M[src] = True\n",
+    "    print(src)\n",
+    "    for i in range(G.order):\n",
+    "        if G.adjlists[src][i] and not M[i]:\n",
+    "            aux(G, M, i)\n",
+    "\n",
+    "\n",
+    "def DFS(G):\n",
+    "    M = [False]*G.order\n",
+    "    for element in range(G.order):\n",
+    "        if not M[element]:\n",
+    "            aux(G, M, element)\n",
+    "            print()\n",
+    "\n",
+    "dfs(G)"
+   ],
+   "id": "507b403020a6f941",
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0\n",
+      "1\n"
+     ]
+    },
+    {
+     "ename": "IndexError",
+     "evalue": "list index out of range",
+     "output_type": "error",
+     "traceback": [
+      "\u001B[0;31m---------------------------------------------------------------------------\u001B[0m",
+      "\u001B[0;31mIndexError\u001B[0m                                Traceback (most recent call last)",
+      "Cell \u001B[0;32mIn[36], line 16\u001B[0m\n\u001B[1;32m     13\u001B[0m             aux(G, M, element)\n\u001B[1;32m     14\u001B[0m             \u001B[38;5;28mprint\u001B[39m()\n\u001B[0;32m---> 16\u001B[0m \u001B[43mdfs\u001B[49m\u001B[43m(\u001B[49m\u001B[43mG\u001B[49m\u001B[43m)\u001B[49m\n",
+      "Cell \u001B[0;32mIn[34], line 12\u001B[0m, in \u001B[0;36mdfs\u001B[0;34m(G)\u001B[0m\n\u001B[1;32m     10\u001B[0m \u001B[38;5;28;01mfor\u001B[39;00m src \u001B[38;5;129;01min\u001B[39;00m \u001B[38;5;28mrange\u001B[39m(G\u001B[38;5;241m.\u001B[39morder):\n\u001B[1;32m     11\u001B[0m     \u001B[38;5;28;01mif\u001B[39;00m \u001B[38;5;129;01mnot\u001B[39;00m M[src]:\n\u001B[0;32m---> 12\u001B[0m         \u001B[43maux\u001B[49m\u001B[43m(\u001B[49m\u001B[43mG\u001B[49m\u001B[43m,\u001B[49m\u001B[43m \u001B[49m\u001B[43mM\u001B[49m\u001B[43m,\u001B[49m\u001B[43m \u001B[49m\u001B[43msrc\u001B[49m\u001B[43m)\u001B[49m\n\u001B[1;32m     13\u001B[0m         \u001B[38;5;28mprint\u001B[39m()\n",
+      "Cell \u001B[0;32mIn[36], line 6\u001B[0m, in \u001B[0;36maux\u001B[0;34m(G, M, src)\u001B[0m\n\u001B[1;32m      4\u001B[0m \u001B[38;5;28;01mfor\u001B[39;00m i \u001B[38;5;129;01min\u001B[39;00m \u001B[38;5;28mrange\u001B[39m(G\u001B[38;5;241m.\u001B[39morder):\n\u001B[1;32m      5\u001B[0m     \u001B[38;5;28;01mif\u001B[39;00m G\u001B[38;5;241m.\u001B[39madjlists[src][i] \u001B[38;5;129;01mand\u001B[39;00m \u001B[38;5;129;01mnot\u001B[39;00m M[i]:\n\u001B[0;32m----> 6\u001B[0m         \u001B[43maux\u001B[49m\u001B[43m(\u001B[49m\u001B[43mG\u001B[49m\u001B[43m,\u001B[49m\u001B[43m \u001B[49m\u001B[43mM\u001B[49m\u001B[43m,\u001B[49m\u001B[43m \u001B[49m\u001B[43mi\u001B[49m\u001B[43m)\u001B[49m\n",
+      "Cell \u001B[0;32mIn[36], line 5\u001B[0m, in \u001B[0;36maux\u001B[0;34m(G, M, src)\u001B[0m\n\u001B[1;32m      3\u001B[0m \u001B[38;5;28mprint\u001B[39m(src)\n\u001B[1;32m      4\u001B[0m \u001B[38;5;28;01mfor\u001B[39;00m i \u001B[38;5;129;01min\u001B[39;00m \u001B[38;5;28mrange\u001B[39m(G\u001B[38;5;241m.\u001B[39morder):\n\u001B[0;32m----> 5\u001B[0m     \u001B[38;5;28;01mif\u001B[39;00m \u001B[43mG\u001B[49m\u001B[38;5;241;43m.\u001B[39;49m\u001B[43madjlists\u001B[49m\u001B[43m[\u001B[49m\u001B[43msrc\u001B[49m\u001B[43m]\u001B[49m\u001B[43m[\u001B[49m\u001B[43mi\u001B[49m\u001B[43m]\u001B[49m \u001B[38;5;129;01mand\u001B[39;00m \u001B[38;5;129;01mnot\u001B[39;00m M[i]:\n\u001B[1;32m      6\u001B[0m         aux(G, M, i)\n",
+      "\u001B[0;31mIndexError\u001B[0m: list index out of range"
+     ]
+    }
+   ],
+   "execution_count": 36
   }
  ],
  "metadata": {