Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#23**.
Example 1
Input: nums = [23,20,5,16,27,38,13], target = 33
Output: [1,6]
nums[1] + nums[6] = 33
Constraints
Acceptance: 68% · Topics: array, hash-table