Given an integer array nums and an integer target, return the indices of two distinct elements whose sum is target. Assume exactly one valid answer exists, and you may not use the same element twice.
nums = [2, 7, 11, 15], target = 9Output[0, 1]Why2 + 7 = 9nums = [3, 2, 4], target = 6Output[1, 2]Why2 + 4 = 6`2 <= len(nums) <= 10^5``-10^9 <= nums[i] <= 10^9``-10^9 <= target <= 10^9`Exactly one valid answer exists