DSA · Reimagined
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Arrays easy time O(n) space O(1)

Move Zeroes

Keep a write pointer for the next non-zero slot. Scan the array; each non-zero value swaps down to that slot. Zeros naturally collect at the back, order preserved.

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0
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1
0
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12
4
0
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w

Write pointer w marks the next slot for a non-zero value.

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Practice

Machine twin: /dsa-viz-v2/move-zeroes.json — the full deterministic run as structured data.