Status: IN
Solutions minimize memory through two complementary strategies — algorithmic (scalar running accumulators replacing materialized collections) and structural (in-place mutation of input data structures) — achieving O(1) auxiliary space at both the computation and interface layers.
Algorithmic and structural space reduction are independent and composable
Depends on (SL): o1-space-via-running-accumulators, in-place-mutation-with-return-convention