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.
Example 1
Input:nums = [2,7,11,15], target = 9
Output:[0,1]
Explanation:Because nums[0] + nums[1] == 9, we return [0, 1].