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    "# ---------------------------------------------------------------\n",
    "# python best courses https://courses.tanpham.org/\n",
    "# ---------------------------------------------------------------\n",
    "# Challenge\n",
    "# \n",
    "# Given a string, find the length of the longest substring\n",
    "# without repeating characters.\n",
    "\n",
    "# Examples:\n",
    "\n",
    "# Given \"abcabcbb\", the answer is \"abc\", which the length is 3.\n",
    "# Given \"bbbbb\", the answer is \"b\", with the length of 1.\n",
    "# Given \"pwwkew\", the answer is \"wke\", with the length of 3.\n",
    "# ---------------------------------------------------------------"
   ]
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