remove-dupes-compare-against-write-head

Status: IN

Uniqueness is checked via `nums[i] != nums[k-1]` (last written value), not `nums[i] != nums[i-1]` (previous read position) — both work on sorted input but the write-head form generalizes to the Remove Duplicates II variant.

Source: entries/2026/06/06/remove-duplicates-from-sorted-array-solution.md

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