每日一题力扣1 两数之和

 

 

class Solution:
    def twoSum(self, nums: List[int], target: int) -> List[int]:
        d={}
        for i ,x in enumerate(nums):
            another_num=target-x
            if another_num in d:
                return [d[another_num],i]
            d[x]=i
        return None