Easy
Return the indices of two numbers whose sum matches a target.
Given an integer array and a target, return the indices of the two distinct values whose sum equals the target. Assume exactly one valid pair exists.
Examples
Input: nums = [2,7,11,15], target = 9
Output: [0,1]
Constraints
- 2 <= nums.length
- Exactly one answer exists
- Do not reuse the same element twice