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    "https://leetcode.com/problems/merge-k-sorted-lists\n",
    "\n",
    "\n",
    "Runtime: 189 ms, faster than 25.85% of Python3 online submissions for Merge k Sorted Lists.\n",
    "Memory Usage: 17.8 MB, less than 82.40% of Python3 online submissions for Merge k Sorted Lists.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def mergeKLists(self, lists: List[Optional[ListNode]]) -> Optional[ListNode]:\n",
    "        #8:56\n",
    "        nodeList = []\n",
    "        \n",
    "        for oneList in lists:\n",
    "            node = oneList\n",
    "            while node:\n",
    "                nodeList.append(node)\n",
    "                node = node.next\n",
    "        \n",
    "        nodeList.sort(key=lambda x: x.val)\n",
    "        \n",
    "        if len(nodeList) == 0: return None\n",
    "        \n",
    "        head = nodeList[0]\n",
    "        lastNode = head\n",
    "        for i, node in enumerate(nodeList[1:]):\n",
    "            lastNode.next = node\n",
    "            lastNode = node\n",
    "        nodeList[-1].next = None\n",
    "        \n",
    "        return head\n",
    "        #8:59\n",
    "        #debug until 9:02\n",
    "```"
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