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    "https://leetcode.com/problems/uncommon-words-from-two-sentences\n",
    "\n",
    "\n",
    "Runtime: 200 ms, faster than 14.29% of Kotlin online submissions for Uncommon Words from Two Sentences.\n",
    "Memory Usage: 36.1 MB, less than 57.14% of Kotlin online submissions for Uncommon Words from Two Sentences.\n",
    "\n",
    "\n",
    "\n",
    "```kotlin\n",
    "class Solution {\n",
    "    var c = HashMap<String, Int>()\n",
    "\n",
    "    fun updateCounter(l: List<String>) {\n",
    "        for (v in l) {\n",
    "            if (c.contains(v)) {\n",
    "                c.get(v)?.plus(1)?.let { c.put(v, it) }\n",
    "            } else {\n",
    "                c[v] = 1\n",
    "            }\n",
    "        }\n",
    "    }\n",
    "\n",
    "    fun uncommonFromSentences(A: String, B: String): Array<String> {\n",
    "        var a = A.split(\" \")\n",
    "        var b = B.split(\" \")\n",
    "        updateCounter(a)\n",
    "        updateCounter(b)\n",
    "        var r = ArrayList<String>()\n",
    "        for ((k,v) in c) {\n",
    "            if (v == 1) {\n",
    "                r.add(k)\n",
    "            }\n",
    "        }\n",
    "        return r.toTypedArray()\n",
    "    }\n",
    "}\n",
    "```"
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