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    "https://leetcode.com/problems/design-hashset/\n",
    "\n",
    "\n",
    "Runtime: 728 ms, faster than 18.75% of Kotlin online submissions for Design HashSet.\n",
    "Memory Usage: 93.2 MB, less than 12.50% of Kotlin online submissions for Design HashSet.\n",
    "\n",
    "\n",
    "\n",
    "```kotlin\n",
    "class MyHashSet() {\n",
    "    var m = HashMap<Int, Boolean>()\n",
    "    fun add(key: Int) {\n",
    "        m.put(key, true)\n",
    "    }\n",
    "    fun remove(key: Int) {\n",
    "        m.remove(key)\n",
    "    }\n",
    "    fun contains(key: Int): Boolean {\n",
    "        return m.containsKey(key)\n",
    "    }\n",
    "}\n",
    "```"
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