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    "https://leetcode.com/problems/partition-list\n",
    "\n",
    "\n",
    "Runtime: 4 ms, faster than 89.51% of C++ online submissions for Partition List.\n",
    "Memory Usage: 10.5 MB, less than 10.77% of C++ online submissions for Partition List.\n",
    "\n",
    "\n",
    "\n",
    "```cpp\n",
    "class Solution {\n",
    "public:\n",
    "    ListNode* partition(ListNode* head, int x) {\n",
    "        //8:51\n",
    "        ListNode* node = head;\n",
    "        vector<int> a;\n",
    "        vector<int> b;\n",
    "        while (node != nullptr) {\n",
    "            if (node->val < x) {\n",
    "                a.push_back(node->val);\n",
    "            } else {\n",
    "                b.push_back(node->val);\n",
    "            }\n",
    "            node = node->next;\n",
    "        }\n",
    "        a.insert(a.end(), b.begin(), b.end());\n",
    "\n",
    "        node = head;\n",
    "        int i = 0;\n",
    "        while (node != nullptr) {\n",
    "            node->val = a[i];\n",
    "            i += 1;\n",
    "            node = node->next;\n",
    "        }\n",
    "\n",
    "        return head;\n",
    "        //8:56\n",
    "    }\n",
    "};\n",
    "```"
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