Best Python Solution (8 lines)

  • 0
        def firstMissingPositive(self, nums):
            :type nums: List[int]
            :rtype: int
            for ind in range(len(nums)):
                real = nums[ind]
                while real>=0 and real<len(nums) and real!=nums[real]:
                    nums[real],real = real,nums[real]
            for i in range(1,len(nums)):
                if nums[i]!=i:  return i
            return len(nums)

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