from typing import List

class Solution:
    def twoSum(self, nums: List[int], target: int) -> List[int]:
        hash = {}
        for i, num in enumerate(nums):
            another = target - num
            if another in hash:
                return [hash[another], i]
            hash[num] = i


if __name__ == "__main__":
    res = Solution().twoSum([2,7,11,15], 9)
    print(res)