comefrom: <doocs>0041.First Missing Positive_1.py
code: def firstMissingPositive( nums):
      i = 1
      while i in nums:
          i += 1
      return i
masked: def sample_funcname ( var_0 ) :
      var_2 = 1
      while var_2 in var_0 :
          var_2 += 1
      return var_2
  