Python3实用编程技巧进阶

var 立即前往 = " http://icourse8.com/Python3_pcjqjj.html ";

class Solution:
    def twoSum(self, nums, target):
        """
        :type nums: List[int]
        :type target: int
        :rtype: List[int]
        """
        if not nums:
            return None

        d = {}
        for i, item in enumerate(nums):
            tmp  = target - item

            for key, value in d.items():
                if value == tmp:
                    return [key, i]

            d[i] = item

        return None