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    "https://leetcode.com/problems/valid-mountain-array\n",
    "\n",
    "\n",
    "Runtime: 204 ms, faster than 58.13% of Python3 online submissions for Valid Mountain Array.\n",
    "Memory Usage: 15.6 MB, less than 55.28% of Python3 online submissions for Valid Mountain Array.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def validMountainArray(self, arr: List[int]) -> bool:\n",
    "        #4:52\n",
    "        up = False\n",
    "        down = False\n",
    "        count = 0\n",
    "        for i, n in enumerate(arr):\n",
    "            if i != 0:\n",
    "                previous = arr[i-1]\n",
    "                current = arr[i]\n",
    "                if previous == current:\n",
    "                    return False\n",
    "                if up == False:\n",
    "                    if (current > previous):\n",
    "                        up = True\n",
    "                    elif (current < previous):\n",
    "                        return False\n",
    "                if up == True:\n",
    "                    if (current < previous):\n",
    "                        down = True\n",
    "                        for new_i,n in enumerate(arr[i:]):\n",
    "                            previous = arr[new_i+i-1]\n",
    "                            current = arr[new_i+i]\n",
    "                            if previous == current:\n",
    "                                return False\n",
    "                            if (current > previous):\n",
    "                                return False\n",
    "                        return True\n",
    "       #5:13\n",
    "```"
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