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    "https://leetcode.com/problems/maximum-depth-of-n-ary-tree/\n",
    "\n",
    "\n",
    "Runtime: 40 ms, faster than 92.67% of Python3 online submissions for Maximum Depth of N-ary Tree.\n",
    "Memory Usage: 16.2 MB, less than 9.73% of Python3 online submissions for Maximum Depth of N-ary Tree.\n",
    "\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def maxDepth(self, root: 'Node') -> int:\n",
    "        #6:15\n",
    "        self.maxLevel = 0\n",
    "        self.travel(root, 1)\n",
    "        return self.maxLevel\n",
    "        #6:21\n",
    "        \n",
    "    def travel(self, node, level):\n",
    "        if node:\n",
    "            if level > self.maxLevel:\n",
    "                self.maxLevel = level\n",
    "            for child in node.children:\n",
    "                self.travel(child, level+1)\n",
    "```"
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