Lab3_BFS_AI.ipynb

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   "source": [
    "## LAB- 3: Write a program to implement BFS algorithm.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from collections import defaultdict"
   ]
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   "metadata": {},
   "outputs": [],
   "source": [
    "class Graph:\n",
    "\n",
    "    def __init__(self):\n",
    "\n",
    "        self.graph = defaultdict(list)\n",
    "\n",
    "    def addEdge(self,u,v):\n",
    "        self.graph[u].append(v)\n",
    "\n",
    "    def BFS(self, s):\n",
    "\n",
    "        visited = [False] * (max(self.graph) + 1)\n",
    "\n",
    "        queue = []\n",
    "\n",
    "        queue.append(s)\n",
    "        visited[s] = True\n",
    "\n",
    "        while queue:\n",
    "            s = queue.pop(0)\n",
    "            print (s, end = \" \")\n",
    "            for i in self.graph[s]:\n",
    "                if visited[i] == False:\n",
    "                    queue.append(i)\n",
    "                    visited[i] = True"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Following is Breadth First Traversal (starting from vertex 2)\n",
      "2 0 3 1 "
     ]
    }
   ],
   "source": [
    "g = Graph()\n",
    "g.addEdge(0, 1)\n",
    "g.addEdge(0, 2)\n",
    "g.addEdge(1, 2)\n",
    "g.addEdge(2, 0)\n",
    "g.addEdge(2, 3)\n",
    "g.addEdge(3, 3)\n",
    "\n",
    "print (\"Following is Breadth First Traversal\"\" (starting from vertex 2)\")\n",
    "g.BFS(2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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