{"id":"running-sum-mutates-input","text":"`runningSum` modifies and returns the input list in-place via forward accumulation rather than allocating a new list; callers lose the original data.","truth_value":"IN","source":"entries/2026/06/06/running-sum-of-1d-array-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"running-sum-mutates-input","truth_value":"IN","reason":"premise"}]}}