{
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   "cell_type": "code",
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   "metadata": {},
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   "source": [
    "d = dict()\n",
    "d[2] = 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "del d[2]"
   ]
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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "https://leetcode.com/problems/custom-sort-string\n",
    "\n",
    "\n",
    "\n",
    "Runtime: 56 ms, faster than 6.43% of Python3 online submissions for Custom Sort String.\n",
    "Memory Usage: 14.3 MB, less than 55.69% of Python3 online submissions for Custom Sort String.\n",
    "\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def customSortString(self, S: str, T: str) -> str:\n",
    "        #6:24\n",
    "        d = dict()\n",
    "        for c in T:\n",
    "            if c in d:\n",
    "                d[c] += 1\n",
    "            else:\n",
    "                d[c] = 1\n",
    "        r = \"\"\n",
    "        for c in S:\n",
    "            if c in d:\n",
    "                r += d[c]*c\n",
    "                del d[c]\n",
    "        for c, counting in d.items():\n",
    "            r += c*counting\n",
    "        return r\n",
    "        #6:30\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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