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Count the number of ordered 4-tuples (a,b,c,d) of distinct elements from nums such that a*b = c*d by grouping all element-pairs by their product and using combinatorics on the number of pairs per product (feasible in O(n^2) time with a hashmap).
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Leetcode 1726. Tuple with Same Product
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Source snapshot: Nov 12, 2026
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