{"id":"sorted-merge-vs-hashmap-strategy","text":"The repo demonstrates two distinct merge-by-key strategies: `merge-similar-items` uses `defaultdict(int)` when inputs are unsorted, while `merge-two-2d-arrays` uses a two-pointer merge when inputs are pre-sorted — the choice is driven by the sorted precondition.","truth_value":"IN","source":"entries/2026/06/06/merge-two-2d-arrays-by-summing-values-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"sorted-merge-vs-hashmap-strategy","truth_value":"IN","reason":"premise"}]}}