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Lifeguards

USACO · 2018 · January · silver-1

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sorting · simulation

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

sample trace

Lifeguards: sorting walkthrough

Lifeguards: use the linked editorial?s sorting, simulation idea on the published sample, then verify the displayed output.

Published input3 5 9 1 4 3 7modelAlgorithm ideaSort by the task-relevant key so the ordering exposes candidates that can be checked locally.task resultExpected output7
  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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