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   "source": [
    "https://leetcode.com/problems/decode-ways/\n",
    "\n",
    "\n",
    "Time Limit Exceeded\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def __init__(self):\n",
    "        #self.dict = {}\n",
    "        #for i, char in enumerate(string.ascii_lowercase):\n",
    "        #    self.dict[i] = char\n",
    "        self.numberList = [str(i) for i in range(1, 27)]\n",
    "        self.counting = 0\n",
    "    \n",
    "    def myDecodeStep(self, numberString):\n",
    "        if (len(numberString) == 0):\n",
    "            self.counting += 1\n",
    "            return\n",
    "        \n",
    "        oneChar = numberString[:1]\n",
    "        if oneChar in self.numberList:\n",
    "            self.myDecodeStep(numberString[1:])\n",
    "        \n",
    "        twoChar = numberString[:2]\n",
    "        if len(twoChar) == 2:\n",
    "            if twoChar in self.numberList:\n",
    "                self.myDecodeStep(numberString[2:])\n",
    "    \n",
    "    def numDecodings(self, s: str) -> int:\n",
    "        #2022.1.5 8:28\n",
    "        self.counting = 0\n",
    "        \n",
    "        self.myDecodeStep(s)\n",
    "        \n",
    "        return self.counting\n",
    "        #2022.1.5 8:35\n",
    "        #debug until 8:43\n",
    "```"
   ]
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   "source": [
    "https://leetcode.com/problems/decode-ways\n",
    "\n",
    "\n",
    "Success!\n",
    "\n",
    "___\n",
    "\n",
    "\n",
    "Runtime    Beats\n",
    "40 ms      80.41%\n",
    "\n",
    "Memory     Beats\n",
    "15.4 MB    7.43%\n",
    "\n",
    "___\n",
    "\n",
    "Try it again, it solves 99% of the problems you meet in your life.\n",
    "\n",
    "___\n",
    "\n",
    "```python\n",
    "from functools import lru_cache\n",
    "\n",
    "class Solution:\n",
    "    def __init__(self):\n",
    "        self.numberList = [str(i) for i in range(1, 27)]\n",
    "        self.counting = 0\n",
    "    \n",
    "    @lru_cache(maxsize=None, typed=True)\n",
    "    def myDecodeStep(self, numberString: str):\n",
    "        counting = 0\n",
    "\n",
    "        if (len(numberString) == 0):\n",
    "            counting += 1\n",
    "            return counting\n",
    "        \n",
    "        oneChar = numberString[:1]\n",
    "        if oneChar in self.numberList:\n",
    "            counting += self.myDecodeStep(numberString[1:])\n",
    "        \n",
    "        twoChar = numberString[:2]\n",
    "        if len(twoChar) == 2:\n",
    "            if twoChar in self.numberList:\n",
    "                counting += self.myDecodeStep(numberString[2:])\n",
    "        \n",
    "        return counting\n",
    "    \n",
    "    def numDecodings(self, s: str) -> int:\n",
    "        #2022.12.16 5:09\n",
    "        return self.myDecodeStep(s)\n",
    "        #2022.12.16 5:17\n",
    "```"
   ]
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