set-conversion-before-loop-for-o1-lookup

Status: IN

`greatest-english-letter` converts the input string to a set before the scan loop, turning each membership check from O(n) to O(1).

Source: entries/2026/06/06/greatest-english-letter-in-upper-and-lower-case-solution.md

Depended on by

• set-for-o1-membership-universal

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