Given `nums` and `target`, return indices of two distinct numbers that add up to `target`. Exactly one solution exists. Variant **#17**.
Example 1
Input: nums = [17,2,39,10,21,32,3,14,25,36,7,18,29,0,11,22,33,4,15,26,21], target = 23
Output: [1,4]
nums[1] + nums[4] = 23
Constraints
Acceptance: 62% · Topics: array, hash-table