268. 缺失数字

class Solution(object):
    def missingNumber(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        for i in range(len(nums) + 1):
            if i not in nums:
                return i


if __name__ == '__main__':
    solution = Solution()
    print(solution.missingNumber([9, 6, 4, 2, 3, 5, 7, 0, 1]))
    print(solution.missingNumber([0]))