Circular Array DP

The Circular Array DP technique is applied when tackling problems characterized by specific invariants in the problem state or constraints:

• Core Strategy: Handle a circular adjacency constraint by reducing to two linear DP passes that each exclude one end.
• 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 Dynamic Programming foundations, reducing worst-case algorithmic complexity.