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Two Sum
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Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

Example:

Given nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].

Solution

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