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Square Pasture

USACO · 2020 · December · gold-3

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sorting · two-pointers

The organizer’s problem statement is available at the official source link.

sample trace

Square Pasture: sorting walkthrough

Square Pasture: use the linked editorial?s sorting, two pointers idea on the published sample, then verify the displayed output.

Published input4 0 2 2 3 3 1 1 0 16 17 4 16 13 0 15 1 19 7 11 3 17 6 16 18 9 15 6 11 7 10 8 2 1 12 0 5 18 14 5 13 2modelAlgorithm ideaSort by the task-relevant key so the ordering exposes candidates that can be checked locally.task resultExpected output14 420
  1. 1

    Order

    Sort items by the comparison key used by the task.
  2. 2

    Scan

    Inspect the ordered neighbors or groups and update the candidate result.
  3. 3

    Finish

    Use the final aggregate or selected item as the answer.
  4. 4

    Verify the sample

    Use the published sample output to check the result of this idea on the displayed input.
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