parity-slot-preservation-invariant

Status: IN

In `largest-number-after-digit-swaps-by-parity/solution.py`, the output digit at every position has the same odd/even parity as the input digit at that position — enforced by dual-pointer reconstruction from separate sorted pools

Source: entries/2026/06/06/largest-number-after-digit-swaps-by-parity-solution.md

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