medium Two Pointers
3Sum
Return all unique triplets [a, b, c] from `nums` with a + b + c = 0. The result is sorted, and each triplet is in ascending order. Example: [-1, 0, 1, 2, -1, -4] → [[-1, -1, 2], [-1, 0, 1]].
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Return all unique triplets [a, b, c] from `nums` with a + b + c = 0. The result is sorted, and each triplet is in ascending order. Example: [-1, 0, 1, 2, -1, -4] → [[-1, -1, 2], [-1, 0, 1]].