Multi-Pass String Construction

The Multi-Pass String Construction technique is applied when tackling problems characterized by specific invariants in the problem state or constraints:

• Core Strategy: Build an output string through several structured passes or an explicit layout algorithm, rather than one linear scan.
• 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 Strings foundations, reducing worst-case algorithmic complexity.