
Question: Two Sum Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to the target.
You may assume that each input would have exactly one solution, and you may not use the same element twice.
Example: Input: nums = [2, 7, 11, 15], target = 9 Output: [0, 1] Explanation: The sum of 2 and 7 equals 9. Therefore, the indices of the two numbers are 0 and 1.
Write a function twoSum that takes in an array of integers nums and an integer target, and returns an array of two integers representing the indices of the two numbers in the array that add up to the target.
Note: You may assume that there is only one valid solution available.

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