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    "https://leetcode.com/problems/design-hashset\n",
    "\n",
    "\n",
    "Runtime: 192 ms, faster than 16.94% of C++ online submissions for Design HashSet.\n",
    "Memory Usage: 42 MB, less than 69.76% of C++ online submissions for Design HashSet.\n",
    "\n",
    "\n",
    "```cpp\n",
    "#include <set>\n",
    "\n",
    "using namespace std;\n",
    "\n",
    "class MyHashSet\n",
    "{\n",
    "public:\n",
    "    /** Initialize your data structure here. */\n",
    "    set<int> mySet;\n",
    "\n",
    "    MyHashSet() {\n",
    "    }\n",
    "\n",
    "    void add(int key) {\n",
    "        mySet.insert(key);\n",
    "    }\n",
    "\n",
    "    void remove(int key) {\n",
    "        mySet.erase(key);\n",
    "    }\n",
    "\n",
    "    /** Returns true if this set contains the specified element */\n",
    "    bool contains(int key) {\n",
    "        return mySet.find(key) != mySet.end();\n",
    "    }\n",
    "};\n",
    "```"
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