leetcode -- Contains Duplicate -- 过于简单

https://leetcode.com/problems/contains-duplicate/

class Solution(object):    def containsDuplicate(self, nums):        """        :type nums: List[int]        :rtype: bool        """        mydict = {}        for i in xrange(len(nums)):            if nums[i] in mydict:                return True            else:                mydict[nums[i]] = i        return False