Status: IN
Every problem directory contains a `solution.py` with a `Solution` class exposing a single public method, following LeetCode's standard interface pattern.
Source: entries/2026/06/06/a-number-after-a-double-reversal-solution.md, entries/2026/06/06/add-digits-solution.md, entries/2026/06/06/add-strings-solution.md
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