{
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      "text/plain": [
       "'1'"
      ]
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     "execution_count": 5,
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   "source": [
    "format(1, \"b\")"
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     "execution_count": 7,
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   "source": [
    "format(1, \"b\").count(\"1\")"
   ]
  },
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   "metadata": {},
   "source": [
    "https://leetcode.com/problems/counting-bits\n",
    "\n",
    "\n",
    "Runtime: 96 ms, faster than 35.74% of Python3 online submissions for Counting Bits.\n",
    "Memory Usage: 20.9 MB, less than 38.77% of Python3 online submissions for Counting Bits.\n",
    "\n",
    "\n",
    "```python\n",
    "class Solution:\n",
    "    def countBits(self, num: int) -> List[int]:\n",
    "        r = []\n",
    "        for i in range(0, num+1):\n",
    "            r.append(format(i, \"b\").count(\"1\"))\n",
    "        return r\n",
    "```\n",
    "\n",
    "\n",
    "Spent 5 minutes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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