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    "https://leetcode.com/problems/linked-list-cycle-ii\n",
    "\n",
    "\n",
    "Runtime: 816 ms, faster than 5.01% of Python3 online submissions for Linked List Cycle II.\n",
    "Memory Usage: 17.3 MB, less than 22.85% of Python3 online submissions for Linked List Cycle II.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def detectCycle(self, head: ListNode) -> ListNode:\n",
    "        #6:27\n",
    "        nodes = []\n",
    "        ids = []\n",
    "        \n",
    "        node = head\n",
    "        index = 0\n",
    "        while node != None:\n",
    "            ok = False\n",
    "            id_ = id(node)\n",
    "            if (id_ in ids):\n",
    "                ok = True\n",
    "            ids.append(id_)\n",
    "            nodes.append(node)\n",
    "            if (ok == True):\n",
    "                return nodes[index]\n",
    "            node = node.next\n",
    "            index += 1\n",
    "        return None\n",
    "        #6:33\n",
    "```"
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