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    "https://leetcode.com/problems/random-pick-index\n",
    "\n",
    "\n",
    "Runtime: 320 ms, faster than 42.00% of Python3 online submissions for Random Pick Index.\n",
    "Memory Usage: 23.1 MB, less than 47.74% of Python3 online submissions for Random Pick Index.\n",
    "\n",
    "\n",
    "```python\n",
    "import random\n",
    "\n",
    "class Solution:\n",
    "\n",
    "    def __init__(self, nums: List[int]):\n",
    "        self.d = dict()\n",
    "        for i, v in enumerate(nums):\n",
    "            if v not in self.d:\n",
    "                self.d[v] = [i]\n",
    "            else:\n",
    "                self.d[v].append(i)\n",
    "\n",
    "    def pick(self, target: int) -> int:\n",
    "        #6:40\n",
    "        return random.choice(self.d[target])\n",
    "        #6:42\n",
    "```"
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