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Count Triplets With Sum at Most Target

Google● MediumINTERNONSITE INTERVIEW

Problem statement

Given an integer array nums and an integer target, return the number of index triplets (i, j, k) such that:

0 <= i < j < k < nums.length.
nums[i] + nums[j] + nums[k] <= target.

Each distinct index combination counts separately, even when multiple indices contain the same value.

The problem statement continues

Pro

Examples

Example 1

nums = [1,2,3,4,5]target = 8return = 4

The valid index triplets select values (1,2,3), (1,2,4), (1,2,5), and (1,3,4). Their sums are 6, 7, 8, and 8.

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