{"id":"palindrome-ll-slow-pointer-guard","text":"The `while fast.next and fast.next.next` guard places `slow` at the last node of the first half — using the alternative `while fast and fast.next` would overshoot by one node and break the split","truth_value":"IN","source":"entries/2026/06/06/palindrome-linked-list-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"palindrome-ll-slow-pointer-guard","truth_value":"IN","reason":"premise"}]}}