Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#43**.
Example 1
Input: nums = [3,30,25,36,7,18,3], target = 33
Output: [0,1]
nums[0] + nums[1] = 33
Constraints
Acceptance: 71% · Topics: array, hash-table