Status: IN
Solutions achieve comprehensive correctness for all inputs within LeetCode's stated constraints, covering both edge cases (empty inputs, zero, single elements) and general cases (via construction techniques including exact arithmetic, sentinel initialization, and streaming invariants).
Edge-case crash-freedom (depth-1) and construction correctness (depth-4) jointly cover the full valid-input space; gated on known counterexamples where specific solutions fail on valid inputs
Depends on (SL): edge-case-inputs-crash-free, construction-correctness-universal-for-valid-inputs
Unless: pillow-holder-n1-crash, zero-input-returns-false, zero-input-returns-wrong-result, find-difference-reduce-no-initial-value