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   "source": [
    "https://leetcode.com/problems/contains-duplicate-ii/\n",
    "\n",
    "Runtime: 28 ms, faster than 23.08% of Go online submissions for Contains Duplicate II.\n",
    "Memory Usage: 15.4 MB, less than 8.88% of Go online submissions for Contains Duplicate II.\n",
    "\n",
    "```go\n",
    "package main\n",
    "\n",
    "import \"fmt\"\n",
    "import \"math\"\n",
    "\n",
    "var length_limit = 0\n",
    "var result = make([][]int, 0)\n",
    "\n",
    "func loop(l []int, n int, left_list []int) {\n",
    "\tif n == length_limit {\n",
    "\t\treturn\n",
    "\t}\n",
    "\tfor i, e := range left_list {\n",
    "\t\tvar new = append(l, e)\n",
    "\t\tif len(new) == length_limit {\n",
    "\t\t\tresult = append(result, new)\n",
    "\t\t}\n",
    "\t\tloop(new, n+1, left_list[i+1:])\n",
    "\t}\n",
    "}\n",
    "\n",
    "func my_combinations(source_list []int, length int) [][]int {\n",
    "\tresult = result[:0]\n",
    "\tlength_limit = length\n",
    "\tloop([]int{}, 0, source_list)\n",
    "\treturn result\n",
    "}\n",
    "\n",
    "func containsNearbyDuplicate(nums []int, k int) bool {\n",
    "\t//8:58\n",
    "    if len(nums) == 1 {\n",
    "        return false\n",
    "    }\n",
    "\tvar num_dict = make(map[int][]int)\n",
    "    var all_one = true\n",
    "\tfor  i, n := range nums {\n",
    "        if n != 1 {\n",
    "            all_one = false\n",
    "        }\n",
    "\t\t_, exists := num_dict[n]\n",
    "\t\tif exists {\n",
    "\t\t\tnum_dict[n] = append(num_dict[n], i)\n",
    "\t\t} else  {\n",
    "\t\t\tnum_dict[n] = []int{i}\n",
    "\t\t}\n",
    "\t}\n",
    "    if (all_one) {\n",
    "        return true\n",
    "    }\n",
    "\tfor _, value := range num_dict {\n",
    "\t\tif len(value) >= 2 {\n",
    "\t\t\tfor _, combination := range my_combinations(value, 2) {\n",
    "                if int(math.Abs(float64(combination[0]) - float64(combination[1]))) <= k {\n",
    "\t\t\t\t\treturn true;\n",
    "\t\t\t\t}\n",
    "\t\t\t}\n",
    "\t\t}\n",
    "\t}\n",
    "\treturn false;\n",
    "    //9:12\n",
    "}\n",
    "```"
   ]
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