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    "https://leetcode.com/problems/swap-nodes-in-pairs\n",
    "\n",
    "\n",
    "Runtime: 0 ms, faster than 100.00% of Go online submissions for Swap Nodes in Pairs.\n",
    "Memory Usage: 2.2 MB, less than 7.74% of Go online submissions for Swap Nodes in Pairs.\n",
    "\n",
    "\n",
    "```go\n",
    "func swapPairs(head *ListNode) *ListNode {\n",
    "\t//6:54\n",
    "\tvar list1 = make([]*ListNode, 0)\n",
    "\tvar node = head\n",
    "\tfor node != nil {\n",
    "\t\tlist1 = append(list1, node)\n",
    "\t\tnode = node.Next\n",
    "\t}\n",
    "\tif len(list1) == 0 {\n",
    "\t\treturn nil\n",
    "\t}\n",
    "\tvar list2 = make([]*ListNode, 0)\n",
    "\tfor index, node := range list1 {\n",
    "\t\tif index%2 != 0 {\n",
    "            if len(list2) == 0 {\n",
    "\t\t\t\tlist2 = append(list2, node)\n",
    "\t\t\t} else {\n",
    "\t\t\t\tvar old_last_value = list2[len(list2)-1]\n",
    "\t\t\t\tlist2 = list2[:len(list2)-1]\n",
    "\t\t\t\tlist2 = append(list2, node)\n",
    "\t\t\t\tlist2 = append(list2, old_last_value)\n",
    "\t\t\t}\n",
    "        } else {\n",
    "            list2 = append(list2, node)\n",
    "        }\n",
    "\t}\n",
    "\tfor index, node := range list2 {\n",
    "\t\tif index == len(list2)-1 {\n",
    "\t\t\tnode.Next = nil\n",
    "\t\t} else {\n",
    "\t\t\tnode.Next = list2[index+1]\n",
    "\t\t}\n",
    "\t}\n",
    "\treturn list2[0]\n",
    "\t//7:03\n",
    "    //debug until 7:07\n",
    "}\n",
    "```"
   ]
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