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Generate all unique triplets (a, b, c) drawn from given values/ranges that satisfy the problem's validity rules (e.g., distinctness, ordering, and relational or aggregate constraints). The task is a combinatorial enumeration problem typically solved with careful generation plus pruning (sorting + two-pointer or hashing) to avoid duplicates and reduce complexity.
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Leetcode 1623. All Valid Triplets That Can Represent a Country
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Source snapshot: Nov 12, 2026
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