Count how many index triplets (i < j < k) in a strictly increasing array form an arithmetic progression with common difference diff, i.e., nums[j]-nums[i] == diff and nums[k]-nums[j] == diff. Equivalently, count values x in nums for which x+diff and x+2*diff also appear.
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Find the number of triplets (i, j, k) from three sorted arrays A, B, C of equal length N, such that the absolute difference between any two elements of the triplet is less than or equal to a given non-negative integer D. Solve in O(nlogn) time and O(1) space complexity.
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