Two Sum Index Lookup

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Your question is Two Sum Index Lookup. Start with the requirements on the right.

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Problem

Given an integer array nums and an integer target, return the indices of the two distinct elements whose values add up to target. Return the indices as a list of two integers in any order. You may assume exactly one valid answer exists.

Constraints

2 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
-10^9 <= target <= 10^9
Exactly one valid pair exists
You may not use the same element twice

Function Signature

def two_sum(nums, target):

Your solutionPython 3

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