#
# @lc app=leetcode.cn id=1 lang=python3
#
# [1] 两数之和
#

# @lc code=start
# class Solution:
#     def twoSum(self, nums: List[int], target: int) -> List[int]:
#         n = len(nums)
#         for i in range(n):
#             for j in range(i + 1, n):
#                 if nums[i] + nums[j] == target:
#                     return [i, j]
#         return  []
class Solution:
    def twoSum(self,nums:List[int],target:int)->List[int]:
        hashtable = dict()
        for i,num in enumerate(nums):
            if target - num in hashtable:
                return [hashtable[target - num],i]
            hashtable[nums[i]]=i;
        return []

# @lc code=end