class Solution:
  def judgeString(subString):
    strSet = set()#不要这样使用,还以为是dict
    for c in subString:
      if c not in strSet:
        strSet.add(c)
      else:
        return False
    return True
  
  def lengthOfLongestSubstring(self, s):
    max_ = 0
    temp_ = 0
    for i in range(0,len(s)):
      for j in range(i,len(s)+1):
        if i == 0 and j == len(s):
          pass
        else:
          if judgeString(s[i:j]):
            temp_ = len(s[i:j])
            max_ = temp_ if temp_ > max_ else max_
        return max_