Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#30**.
Example 1
Input: nums = [30,41,12,23,34,5,16,27,38,9,20,31,2,12], target = 53
Output: [0,3]
nums[0] + nums[3] = 53
Constraints
Acceptance: 61% · Topics: array, hash-table