Medium, Array/String

给定字符串，寻找不包含重复字符的最长子字符串。

Example:
'abcabcbb'的最长子字符串是'abc';
'bbb'的最长子字符串是’b'

Solution

建立字符的index字典，如果字符已经存在，跳过。

class Solution(object):
    def lengthOfLongestSubstring(self, s):
        """
        :type s: str
        :rtype: int
        """
        i, maxlen = 0, 0
        charMap = {}
        
        for j in xrange(len(s)):
            if s[j] in charMap and i <= charMap[s[j]]:
                i = charMap[s[j]] + 1
                
            charMap[s[j]] = j
            maxlen = max(j-i+1,maxlen)
            
        return maxlen
       ```