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   "source": [
    "## Number 448"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "[https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/](https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from typing import List\n",
    "\n",
    "class Solution:\n",
    "    def findDisappearedNumbers(self, nums: List[int]) -> List[int]:\n",
    "        \"\"\"\n",
    "     \n",
    "        \"\"\"\n",
    "        max_num = len(nums)\n",
    "        desired_dict = {i:0 for i in range(1,max_num+1)}\n",
    "        for i in nums:\n",
    "            desired_dict[i] = desired_dict[i]+1\n",
    "        return [i for i in desired_dict.keys() if desired_dict[i]==0]\n",
    "\n",
    "a = Solution()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[5, 6]\n",
      "[2]\n"
     ]
    }
   ],
   "source": [
    "print(a.findDisappearedNumbers([4,3,2,7,8,2,3,1]))\n",
    "print(a.findDisappearedNumbers([1,1]))"
   ]
  }
 ],
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