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    "https://leetcode.com/problems/swap-nodes-in-pairs\n",
    "\n",
    "\n",
    "Runtime: 32 ms, faster than 63.92% of Python3 online submissions for Swap Nodes in Pairs.\n",
    "Memory Usage: 14.2 MB, less than 47.06% of Python3 online submissions for Swap Nodes in Pairs.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def swapPairs(self, head: ListNode) -> ListNode:\n",
    "        #6:42\n",
    "        l = []\n",
    "        node = head\n",
    "        while node != None:\n",
    "            l.append(node)\n",
    "            node = node.next\n",
    "            \n",
    "        if len(l) == 0:\n",
    "            return None\n",
    "        \n",
    "        new_l = []\n",
    "        for index, node in enumerate(l):\n",
    "            if (index % 2 != 0):\n",
    "                new_l.insert(len(new_l)-1, node)\n",
    "            else:\n",
    "                new_l.append(node)\n",
    "        for index, node in enumerate(new_l):\n",
    "            if (index == len(new_l) - 1):\n",
    "                node.next = None\n",
    "            else:\n",
    "                node.next = new_l[index+1]\n",
    "        return new_l[0]\n",
    "        #6:49\n",
    "```"
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