{"id":"tribonacci-iterative-o1-space","text":"`tribonacci` uses O(1) auxiliary space via a three-variable sliding window `(a, b, c)`, not memoization or a DP array.","truth_value":"IN","source":"entries/2026/06/06/n-th-tribonacci-number-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"tribonacci-iterative-o1-space","truth_value":"IN","reason":"premise"}]}}