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    "https://leetcode.com/problems/valid-mountain-array\n",
    "\n",
    "\n",
    "Runtime: 24 ms, faster than 93.84% of C++ online submissions for Valid Mountain Array.\n",
    "Memory Usage: 22.3 MB, less than 96.79% of C++ online submissions for Valid Mountain Array.\n",
    "\n",
    "\n",
    "```cpp\n",
    "#include <vector>\n",
    "#include <algorithm>\n",
    "#include <bits/stdc++.h> \n",
    "\n",
    "using namespace std;\n",
    "\n",
    "class Solution {\n",
    "public:\n",
    "    bool validMountainArray(vector<int>& arr) {\n",
    "        //5:18\n",
    "        if (arr.size()==1) {\n",
    "            return false;\n",
    "        }\n",
    "        bool up = false;\n",
    "        bool down = false;\n",
    "        int count = 0;\n",
    "        for (int i=0; i < arr.size(); i++) {\n",
    "            if (i != 0) {\n",
    "                auto previous = arr[i-1];\n",
    "                auto current = arr[i];\n",
    "                if (previous == current) {\n",
    "                    return false;\n",
    "                }\n",
    "                if (up == false) {\n",
    "                    if ( current > previous) {\n",
    "                        up = true;\n",
    "                    } else if (current < previous) {\n",
    "                        return false;\n",
    "                    }\n",
    "                }\n",
    "                if (up == true) {\n",
    "                    if ( current < previous) {\n",
    "                        down = true;\n",
    "                        for (int new_i=i; new_i < arr.size(); new_i++) {\n",
    "                            auto previous = arr[new_i-1];\n",
    "                            auto current = arr[new_i];\n",
    "                            if (previous == current) {\n",
    "                                return false;\n",
    "                            }\n",
    "                            if (current > previous){\n",
    "                                return false;\n",
    "                            }\n",
    "                        }\n",
    "                        return true;\n",
    "                    }\n",
    "                }\n",
    "            }\n",
    "        }\n",
    "        return false;\n",
    "        //5:28\n",
    "    }\n",
    "};\n",
    "```"
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