Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#9**.
Example 1
Input: nums = [9,28,31,2,13,24,35,6,17,28,39,10,15], target = 43
Output: [1,12]
nums[1] + nums[12] = 43
Constraints
Acceptance: 57% · Topics: array, hash-table