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    "https://leetcode.com/problems/lru-cache\n",
    "\n",
    "\n",
    "Runtime: 2956 ms, faster than 5.00% of Python3 online submissions for LRU Cache.\n",
    "Memory Usage: 74.2 MB, less than 36.60% of Python3 online submissions for LRU Cache.\n",
    "\n",
    "\n",
    "```python\n",
    "class LRUCache:\n",
    "\n",
    "    def __init__(self, capacity: int):\n",
    "        #3:39\n",
    "        self.history = []\n",
    "        self.dict_ = {}\n",
    "        self.capacity = capacity\n",
    "        #3:45\n",
    "        #debug until 4:04\n",
    "\n",
    "    def get(self, key: int) -> int:\n",
    "        #print(self.history)\n",
    "        if key in self.dict_:\n",
    "            self.history.remove(key)\n",
    "            self.history.append(key)\n",
    "            return self.dict_[key]\n",
    "        else:\n",
    "            return -1\n",
    "\n",
    "    def put(self, key: int, value: int) -> None:\n",
    "        if key in self.dict_:\n",
    "            self.history.remove(key)\n",
    "            self.history.append(key)\n",
    "            self.dict_[key] = value\n",
    "            return None\n",
    "        else:\n",
    "            if len(self.history) >= self.capacity:\n",
    "                old_key = self.history[0]\n",
    "                self.history = self.history[1:]\n",
    "                del self.dict_[old_key]\n",
    "            self.dict_[key] = value\n",
    "            self.history.append(key)\n",
    "            return None\n",
    "```"
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