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    "https://leetcode.com/problems/duplicate-zeros\n",
    "\n",
    "\n",
    "\n",
    "Runtime: 72 ms, faster than 42.52% of Python3 online submissions for Duplicate Zeros.\n",
    "Memory Usage: 14.7 MB, less than 36.54% of Python3 online submissions for Duplicate Zeros.\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def duplicateZeros(self, arr: List[int]) -> None:\n",
    "        \"\"\"\n",
    "        Do not return anything, modify arr in-place instead.\n",
    "        \"\"\"\n",
    "        length = len(arr)\n",
    "        i = 0\n",
    "        while i < len(arr):\n",
    "            v = arr[i]\n",
    "            if v == 0:\n",
    "                arr.insert(i, 0)\n",
    "                i += 1\n",
    "            i += 1\n",
    "        while len(arr) > length:\n",
    "            arr.pop()\n",
    "```\n",
    "\n",
    "spent 20 minutes\n",
    "\n",
    "failed 5 times"
   ]
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