{"id":"constant-space-lowercase-constraint","text":"The first-unique-character solution is O(1) space because the problem constrains input to lowercase English letters, capping the Counter at 26 keys regardless of string length.","truth_value":"IN","source":"entries/2026/06/06/first-unique-character-in-a-string-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"constant-space-lowercase-constraint","truth_value":"IN","reason":"premise"}]}}