Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#63**.
Example 1
Input: nums = [23,40,5,16,27,38,43], target = 83
Output: [1,6]
nums[1] + nums[6] = 83
Constraints
Acceptance: 60% · Topics: array, hash-table