Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order. Optimize your solution.

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Accepted Answer

Optimize the Two Sum problem to find indices of two numbers that add up to a target efficiently.

Use a hash map to store numbers and their indices for O(1) lookup.
Iterate through the array, checking if target - current number exists in the map.
Example: For nums = [2, 7, 11, 15] and target = 9, return indices [0, 1].
Time complexity is O(n) and space complexity is O(n) due to the hash map.

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Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order. Optimize your solution.

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