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Sort Colors (Dutch National Flag): three-way partition in one pass.

Sorting an array of three values in one pass tests the three-pointer partition (Dutch National Flag). The signal is the low/mid/high invariant and knowing when not to advance mid. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Sorting an array of three values in one pass tests the three-pointer partition (Dutch National Flag). The signal is the low/mid/high invariant and knowing when not to advance mid. Here is the answer.

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