easyHash Map / Set Pattern
Two Sum
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.
Examples
Input:
nums = [2,7,11,15], target = 9Output:
[0,1]Explanation: nums[0] + nums[1] == 2 + 7 == 9
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