comefrom: <garvit244>03_1.py
code: def lengthOfLongestSubstring( s):
      mapSet = {}
      start, result = 0, 0
      
      for end in range(len(s)):
          if s[end] in mapSet:
              start = max(mapSet[s[end]], start)
          result = max(result, end-start+1)
          mapSet[s[end]] = end+1
      
      return result
masked: def sample_funcname ( var_0 ) :
      var_1 = { }
      var_3 , var_4 = 0 , 0
      for var_7 in range ( len ( var_0 ) ) :
          if var_0 [ var_7 ] in var_1 :
              var_3 = max ( var_1 [ var_0 [ var_7 ] ] , var_3 )
          var_4 = max ( var_4 , var_7 - var_3 + 1 )
          var_1 [ var_0 [ var_7 ] ] = var_7 + 1
      return var_4
  