Editorial for DMOPC '22 Contest 4 P1 - Alone Time

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Author: Riolku

Subtask 1

No moving is possible, so simply calculate the answer.

Subtask 2

Try moving both classes. It is optimal to move each class either as left as possible, or as right as possible.

Subtask 3

Consider each class gap independently. We can try moving each class that bounds this gap up to K away (note that it may cross over a different class), and calculate the resulting gap size. Try this for all gaps.


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