comefrom: <qiyuangong>219_Contains_Duplicate_II_2.py
code: def containsNearbyDuplicate( nums, k):
      check = set()
      for i in range(len(nums)):
          if i > k:
              check.remove(nums[i - k - 1])
          if nums[i] in check:
              return True
          else:
              check.add(nums[i])
      return False
masked: def sample_funcname ( var_0 , var_1 ) :
      var_3 = set ( )
      for var_6 in range ( len ( var_0 ) ) :
          if var_6 > var_1 :
              var_3.remove ( var_0 [ var_6 - var_1 - 1 ] )
          if var_0 [ var_6 ] in var_3 :
              return True
          else :
              var_3.add ( var_0 [ var_6 ] )
      return False
  