Day07_LEETCODE_3. Longest Substring Without Repeating Characters.ipynb

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       "3"
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    "class Solution(object):\n",
    "    def lengthOfLongestSubstring(self, s):\n",
    "        \"\"\"\n",
    "        :type s: str\n",
    "        :rtype: int\n",
    "        \"\"\"\n",
    "        if len(s) >0:\n",
    "                \n",
    "            longestsubstr=s[0]\n",
    "            substr=s[0]\n",
    "            i=1\n",
    "           \n",
    "            while i < len(s)  :  \n",
    "                if s[i] in substr:\n",
    "                    if (len(longestsubstr)< len(substr)):\n",
    "                        longestsubstr=substr\n",
    "                    j=s.find(s[i])\n",
    "                    s= s[j+1:]\n",
    "                    i=1\n",
    "                    \n",
    "                    if len(s)> 0:\n",
    "                        substr=s[0] \n",
    "                else:\n",
    "                    substr+=s[i]                    \n",
    "                    i+=1\n",
    "            \n",
    "            # for cases when  length of s is 2\n",
    "            if (len(longestsubstr)< len(substr)):\n",
    "                longestsubstr=substr\n",
    "        # for cases when  s is an empty string   \n",
    "        else:  longestsubstr=\"\"   \n",
    "        return len(longestsubstr)\n",
    "        \n",
    "solution = Solution()            \n",
    "solution.lengthOfLongestSubstring('pwwkew')"
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