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    "https://leetcode.com/problems/min-stack\n",
    "\n",
    "\n",
    "Runtime: 456 ms, faster than 22.02% of Kotlin online submissions for Min Stack.\n",
    "Memory Usage: 55.5 MB, less than 19.27% of Kotlin online submissions for Min Stack.\n",
    "\n",
    "\n",
    "\n",
    "```kotlin\n",
    "class MinStack() {\n",
    "    /** initialize your data structure here. */\n",
    "    var stack: ArrayList<Int> = ArrayList()\n",
    "\n",
    "    /*\n",
    "    constructor(minstack: MinStack) {\n",
    "        minstack.stack = ArrayList()\n",
    "    }\n",
    "     */\n",
    "\n",
    "    fun push(x: Int) {\n",
    "        this.stack.add(x)\n",
    "    }\n",
    "\n",
    "    fun pop() {\n",
    "        this.stack.removeAt(this.stack.size - 1)\n",
    "    }\n",
    "\n",
    "    fun top(): Int {\n",
    "        return this.stack.get(this.stack.size - 1)\n",
    "    }\n",
    "\n",
    "    fun getMin(): Int? {\n",
    "        return this.stack.toList().min()\n",
    "    }\n",
    "}\n",
    "```"
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