Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#4**.
Example 1
Input: nums = [4,13,26,37,8,19,30,30], target = 43
Output: [1,6]
nums[1] + nums[6] = 43
Constraints
Acceptance: 66% · Topics: array, hash-table