Status: IN
When a closed-form or O(1) mathematical reduction exists, solutions use it instead of simulating the described operation (e.g., digital root formula instead of iterative digit summing, modular arithmetic instead of double-reversal).
Source: entries/2026/06/06/a-number-after-a-double-reversal-solution.md, entries/2026/06/06/add-digits-solution.md
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