Sort Then Two Pointers

The Sort Then Two Pointers technique is applied when tackling problems characterized by specific invariants in the problem state or constraints:

• Core Strategy: Sort the input first, then fix one element and use two pointers over the remainder to find combinations meeting a target.
• When to use: Look for opportunities where repeated re-computation can be replaced by maintaining monotonic properties, state windows, or relational pointers.
• Interview Signal: Demonstrating this pattern shows mastery of Two Pointers foundations, reducing worst-case algorithmic complexity.