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    "https://leetcode.com/problems/monotonic-array\n",
    "\n",
    "\n",
    "Runtime: 52 ms, faster than 98.86% of C++ online submissions for Monotonic Array.\n",
    "Memory Usage: 52.7 MB, less than 71.94% of C++ online submissions for Monotonic Array.\n",
    "\n",
    "\n",
    "```cpp\n",
    "class Solution {\n",
    "public:\n",
    "    bool isMonotonic(vector<int>& A) {\n",
    "        //7:28\n",
    "        if (A.size() == 1) {\n",
    "            return true;\n",
    "        }\n",
    "        bool up = true;\n",
    "        bool down = true;\n",
    "        for(int i=0; i<A.size(); i++) {\n",
    "            if (i+1 < A.size()) {\n",
    "                if (!(A[i] <= A[i+1])) {\n",
    "                    up = false;\n",
    "                }\n",
    "                if (!(A[i] >= A[i+1])) {\n",
    "                    down = false;\n",
    "                }\n",
    "            }\n",
    "        }\n",
    "        return up or down;\n",
    "        //7:30\n",
    "    }\n",
    "};\n",
    "```"
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