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Find Indices of Elements for Sum

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You need to write a function twoSum(nums, target) that takes an array of numbers nums and a number target. The function should return an array with two indices of elements whose sum equals target. It is guaranteed that there is always exactly one solution.

Examples:

Input 1: [3, 3], 6
Output 1: [0, 1]
Input 2: [2, 7, 11, 5, 9, 10, 15], 9
Output 2: [0, 1]
Run your code to see results.