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Quick Summary
Find all index triplets (i, j, k) where i < j < k and nums[i] > nums[j] > nums[k].
Return the total count of strictly decreasing subsequences of length three.
Focuses on counting combinations rather than identifying a single valid triplet.
What This Tests
Nested iteration over arrays
Combinatorial counting logic
Understanding index ordering constraints
Baseline complexity analysis
Common Patterns
Brute Force
Array Traversal
Counting
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