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    "https://leetcode.com/problems/design-hashmap\n",
    "\n",
    "\n",
    "Runtime: 172 ms, faster than 98.07% of Python3 online submissions for Design HashMap.\n",
    "Memory Usage: 17.2 MB, less than 91.33% of Python3 online submissions for Design HashMap.\n",
    "\n",
    "\n",
    "\n",
    "```python\n",
    "class MyHashMap:\n",
    "\n",
    "    def __init__(self):\n",
    "        \"\"\"\n",
    "        Initialize your data structure here.\n",
    "        \"\"\"\n",
    "        self.d = dict()\n",
    "        \n",
    "\n",
    "    def put(self, key: int, value: int) -> None:\n",
    "        \"\"\"\n",
    "        value will always be non-negative.\n",
    "        \"\"\"\n",
    "        self.d[key] = value\n",
    "        \n",
    "\n",
    "    def get(self, key: int) -> int:\n",
    "        \"\"\"\n",
    "        Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key\n",
    "        \"\"\"\n",
    "        if key in self.d:\n",
    "            return self.d[key]\n",
    "        else:\n",
    "            return -1\n",
    "        \n",
    "\n",
    "    def remove(self, key: int) -> None:\n",
    "        \"\"\"\n",
    "        Removes the mapping of the specified value key if this map contains a mapping for the key\n",
    "        \"\"\"\n",
    "        if key in self.d:\n",
    "            del self.d[key]\n",
    "```\n",
    "\n",
    "\n",
    "Spent 2 minutes."
   ]
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