Status: IN
Multiple solutions achieve O(1) auxiliary space by maintaining scalar running-state variables (min-so-far, running-sum, running-max) instead of materializing intermediate arrays or sorted copies.
Running accumulators trade re-traversal impossibility for constant memory across streaming-style problems
Depends on (SL): highest-altitude-single-pass, longest-task-single-pass-o1-space, iterative-reversal-O1-space, min-tracking-pattern-shared