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class Solution(object): def missingNumber(self, nums): """ :type nums: List[int] :rtype: int """ return sum([i for i in xrange(len(nums)+1)])-sum(nums)

similar idea class Solution(object): def missingNumber(self, nums): """ :type nums: List[int] :rtype: int """ return (0+len(nums)) * (len(nums)+1) / 2 - sum(nums)

Of course, that is the mathematical way of expressing the sum function!

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