Status: IN
All solution files assume valid input per LeetCode problem constraints and perform zero input validation — no type checks, no range guards, no empty-input handling.
Source: entries/2026/06/06/1-bit-and-2-bit-characters-solution.md, 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, entries/2026/06/06/add-to-array-form-of-integer-solution.md
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