{"id":"fast-null-guard-sufficient-for-both-pointers","text":"The `while fast and fast.next` guard in `hasCycle` is sufficient for both pointers because `slow` never advances past `fast` in a non-cyclic list.","truth_value":"IN","source":"entries/2026/06/06/linked-list-cycle-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"fast-null-guard-sufficient-for-both-pointers","truth_value":"IN","reason":"premise"}]}}