{"id":"set-conversion-before-loop-for-o1-lookup","text":"`greatest-english-letter` converts the input string to a set before the scan loop, turning each membership check from O(n) to O(1).","truth_value":"IN","source":"entries/2026/06/06/greatest-english-letter-in-upper-and-lower-case-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":["set-for-o1-membership-universal"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"set-conversion-before-loop-for-o1-lookup","truth_value":"IN","reason":"premise"}]}}