leetCode Top100:找到数组中消失的数字

class Solution(object):
    def findDisappearedNumbers(self, nums):
        for i in range(len(nums)):
            index=abs(nums[i])-1
            if nums[index]>0:
                nums[index]*=-1
        result=[]
        for i in range(1,len(nums)+1):
            if nums[i-1]>0:
                result.append(i)
        return result