Solution: Number of Divisible Triplet Sums
C# solution for the Number of Divisible Triplet Sums problem using the Hash Maps pattern.
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Statement
Given an integer array nums and an integer d, count how many index triplets (i, j, k) satisfy all of the following conditions:
The indices are strictly increasing: i < j < k.
The sum nums[i] + nums[j] + nums[k] is divisible by d, meaning (nums[i] + nums[j] + nums[k]) % d == 0.
Return the total number of such triplets.
Constraints:
nums.length...