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    "https://leetcode.com/problems/contains-duplicate-ii\n",
    "\n",
    "\n",
    "Runtime: 116 ms, faster than 7.14% of Python3 online submissions for Contains Duplicate II.\n",
    "Memory Usage: 28.8 MB, less than 6.27% of Python3 online submissions for Contains Duplicate II.\n",
    "\n",
    "\n",
    "```python\n",
    "from itertools import combinations\n",
    "\n",
    "class Solution:\n",
    "    def containsNearbyDuplicate(self, nums: List[int], k: int) -> bool:\n",
    "        #8:07\n",
    "        num_dict = dict()\n",
    "        for index, n in enumerate(nums):\n",
    "            if n in num_dict.keys():\n",
    "                num_dict[n].append((index, n))\n",
    "            else:\n",
    "                num_dict[n] = [(index, n)]\n",
    "        for key, value in num_dict.items():\n",
    "            if len(value) >= 2:\n",
    "                #print(key, value)\n",
    "                for combination in combinations(value, 2):\n",
    "                    a = combination[0][0]\n",
    "                    b = combination[1][0]\n",
    "                    if abs(a-b) <= k:\n",
    "                        return True\n",
    "        return False\n",
    "        #8:14\n",
    "```"
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